Pet to egg archive
SPECIAL thanks to NightFlame22 for documenting this! <3
NightFlame22 put this all together in a PM while I was managing other documentations.
Some parts are edited to help identification, thanks again for your contribution for this thread!
Due to the popularity of the Eggs based off of pets that are released every year in Easter; they now have a separate section of this thread. They're listed in order of the Animal egg number. Dates are included to help identification. Some of the pets currently do NOT have an 'official' name, but are described to help pet identification.

"Pink Balloon"
Original pet:

(Pet release: August 2008)
Egg based off the pet:

(Animal egg #1, Easter 2009)

"Yellow Toxic"
Original pet:

(Pet release: August 2008)
Egg based off the pet:

(Animal egg #2, Easter 2009)

"Floppy Pink Pastel"
Original pet:

(Pet release: November 2008)
Egg based off the pet:

(Animal egg #3, Easter 2009)

"Light-spotted Blue Leopard"
Original pet:

(Pet release: January 2009)
Egg based off the pet:

(Animal egg #4 )

"Sun Cinnamon Dog"
Original pet:

(Pet release: March 2010)
Egg based off the pet:

(Animal egg #5; Released: Easter 2010)

"Black Yin-Yang Dog"
Original pet:

(Pet release: October 2009)
Egg based off the pet:

(Animal egg #6; Released: Easter 2010)

"Good PPS"
Original pet:

Egg based off the pet:

(Pet from August 2009, animal egg #7)

"Evil PPS"
Original pet:

Egg based off the pet:

(Pet from August 2009, animal egg #8)

"Mime PPS"
Original pet:

Egg based off the pet:

(Pet from May 2009, animal egg #9)

"Bright Green Jelly Dog"
Original pet:

Egg based off the pet:

(Pet from March 2010, animal egg #10)

"Ocean Shima Butterfly Wolf"
Original pet:

Egg based off the pet:

(Pet from November 2009, animal egg #11)

"Dark Leopard Butterfly Wolf"
Original pet:

Egg based off the pet:

(Pet from October 2009, animal egg #12)

"Paztec Shima Swirl"
Original pet:

Egg based off the pet:

(Pet from September 2010, animal egg #13)

"Pink Rave Butterfly Wolf"
Original pet:

Egg based off the pet:

(Pet from December 2009, animal egg #14)

"Growing Null Dog"
Original pet:

Egg based off the pet:

(Pet from February 2010, animal egg #15)

"Daybreak Lullaby Dog"
Original pet:

Egg based off the pet:

(Pet from May 2010, animal egg #16)

"Brown Heartwood Dog"
Original pet:

Egg based off the pet:

(Pet from May 2010, animal egg #17)

"Teal Mausaic"
Original pet:

Egg based off the pet:

(Pet from September 2010, animal egg #18)

"Purple Llama Swirl"
Original pet:

Egg based off the pet:

(Pet from September 2011, animal egg #19)

"Red Tiger Butterfly Wolf"
Original pet:

Egg based off the pet:

(Pet from January 2011, animal egg #20)

"Green 3rd Gen Dog"
Original pet:

Egg based off the pet:

(Pet from January 2011, animal egg #21)

"Headphone Subwoofer"
Original pet:

(Pet release: June 2011)
Egg based off the pet:

(Pet from June 2011, animal egg #22)

"Tiger Wild Dog"
Original pet:

Egg based off the pet:

(Pet from July 2011, animal egg #23)

"Brown Blue Tribal Dog"
Original pet:

Egg based off the pet:

(Pet from September 2011, animal egg #24)

"Growing Black Rose Dog"
Original pet:

Egg based off the pet:

(Pet from December 2011, animal egg #25)

"Floppy Choco Sun Dog"
Original pet:

Egg based off the pet:

(Pet from February 2012, animal egg #26)

"Green Bubble Dog"
Original pet:

Egg based off the pet:

(Pet from January 2012, animal egg #27)

"Flop-Eared Pirate Dog"
Original pet:

Egg based off the pet:

(Pet from January 2011, animal egg #28)

"Flop-Eared Sea Glass Dog"
Original pet:

Egg based off the pet:

(Pet from July 2012, animal egg #29)

"Blue-Eyed Pixel Dog"
Original pet:

Egg based off the pet:

(Pet from December 2012, animal egg #30)

"Red-Marked Grey Chia Dog"
Original pet:

Egg based off the pet:

(Pet from December 2012, animal egg #31)

"Brown Salmon Null 2nd Gen"
Original pet:

Egg based off the pet:

(Pet from November 2012, animal egg #32)

"Green Greenpaw Dog"
Original pet:

Egg based off the pet:

(Pet from October 2012, animal egg #33)

"White Paint Cat"
Original pet:

Egg based off the pet:

(Pet from January 2013, animal egg #34)

"(Unnamed)"
Original pet:

Egg based off the pet:

(Pet from November 2012, #35)

"Blue Alien Cat"
Original pet:

Egg based off the pet:

(Pet from December 2011, animal egg #36)

"Mint Toothpaste Butterfly Wolf"
Original pet:

Egg based off the pet:

(Pet from October 2012, animal egg #37)

"Red Alien-Eyed Cat"
Original pet:

Egg based off the pet:

(Pet from January 2012, animal egg #38)

"Bob-Tailed Swamp Dog"
Original pet:

Egg based off the pet:

(Pet from June 2013, animal egg #39)

"SoulWings Sun Dog"
Original pet:

Egg based off the pet:

(Pet from August 2013, animal egg #40)

"Collar Galaxy Second Gen"
Original pet:

Egg based off the pet:

(Pet from January 2014, animal egg #41)

"Turquoise Crystal Dog"
Original pet:

Egg based off the pet:

(Pet from May 2013, animal egg #42)

"Salmon Smile 2nd Gen"
Original pet:

Egg based off the pet:

(Pet from July 2013, animal egg #43)

"Brown Stitch Cat"
Original pet:

Egg based off the pet:

(Pet from May 2013, animal egg #44)

"Silver Coin Cat"
Original pet:

Egg based off the pet:

(Pet from February 2014, animal egg #45)

"Fire 2013 Butterfly Wolf"
Original pet:

Egg based off the pet:

(Pet from June 2013, animal egg #46)

"Purple Banded Butterfly Wolf"
Original pet:

Egg based off the pet:

(Pet from October 2013, animal egg #47)

"(Unnamed)"
Original pet:

Egg based off the pet:

(Pet from January 2014, animal egg #48)

"Pointy Two-Tailed Tricolor Dog"
Original pet:

Egg based off the pet:

(Pet from May 2014, animal egg #49)

"Teal Rainbow Stripe Cat"
Original pet:

Egg based off the pet:

(Pet from May 2014, animal egg #50)

"(Unnamed)"
Original pet:

Egg based off the pet:

(Pet from June 2014, animal egg #51)

"Flaming Rainbow Dog"
Original pet:

Egg based off the pet:

(Pet from July 2014, animal egg #52)

"(Unnamed)"
Original pet:

Egg based off the pet:

(Pet from August 2014, animal egg #53)

"Olive Pizza Cat"
Original pet:

Egg based off the pet:

(Pet from September 2014, animal egg #54)

"(Unnamed)"
Original pet:

(Pet Release: December 2015)
Egg based off the pet:

(Animal egg #55; Release: Easter 2016)

"(Unnamed)"
Original pet:

Egg based off the pet:

(Animal egg #56; Release: Easter 2016)

"Sakura Store Dog"
Original pet:

(Pet Release: Store pet 2014)
Egg based off the pet:

(Animal egg #57; Release: Easter 2016)

"Blue Morality Moon Dog"
Original pet:

Egg based off the pet:

(Pet from January 2016, animal egg #58)

"Good/Bad Blanket Cat"
Original pet:

Egg based off the pet:

(Pet from Christmas 2013, animal egg #59)

"Snowy Night Bunny"
Original pet:

Egg based off the pet:

(Pet from Easter 2011, animal egg #60)

"Dark Pink Shima Butterfly Wolf"
Original pet:

Egg based off the pet:

(Pet from June 2009, animal egg #61)

"(Unnamed)"
Original pet:

Egg based off the pet:

(Pet from Valentine's Day 2016, animal egg #62)

"Dark Paint Splatter Cat"
Original pet:

Egg based off the pet:

(Pet from July 2015, animal egg #63)

"Unnamed"
Original pet:

Egg based off the pet:

(Pet from December 2016, animal egg #64)

"Unnamed"
Original pet:

Egg based off the pet:

(Pet from CS birthday 2012, animal egg #65)

"Unnamed"
Original pet:

Egg based off the pet:

(Pet from March 2017, animal egg #66)

"(Unnamed)"
Original pet:

Egg based off the pet:

(pet from 2015 Easter event, animal egg #67)

"(Unnamed)"
Original pet:

Items based off the pet:

(Pet from November 2016, animal egg #68)

"(Unnamed)"
Original pet:

Egg based off the pet:

(Pet from 2016 Space event, animal egg #69)

"(Unnamed)"
Original pet:

Egg based off the pet:

(pet from January 2016, animal egg #70)

"(Unnamed)"
Original pet:

(Pet release: December 2017)
Egg based off the pet:

(animal egg # 71 Release: Easter 2018)

"(Unnamed)"
Original pet:

(Pet release: Easter 2017)
Egg based off the pet:

(animal egg # 72 Release: Easter 2018)

"(Unnamed)"
Original pet:

(Pet release: July 2017)
Egg based off the pet:

(animal egg #73 Release: Easter 2018)

"Blue Beach Event Squid"
Original pet:

(Pet release: Beach Event 2012)
Egg based off the pet:

(animal egg #74)

"Unnamed"
Original pet:

(Pet release: January 2018)
Egg based off the pet:

(animal egg #75)

"Unnamed"
Original pet:

(Pet release: Easter 2011)
Egg based off the pet:

(animal egg #76 Release: Easter 2018)

"(Unnamed)"
Original pet:

(Pet release: July 2016)
Egg based off the pet:

(animal egg #77 Release: Easter 2019)

"(Unnamed)"
Original pet:

(Pet release: January 2016)
Egg based off the pet:

(animal egg #78 Release: Easter 2019)

"Spirit Cat"
Original pet:

(Pet release: Halloween 2015)
Egg based off the pet:

(animal egg #79 Release: Easter 2019)

"Unnamed"
Original pet:

(Pet release: August 2013)
Egg based off the pet:

(animal egg #80 Release: Easter 2019)

"Star Bat"
Original pet:

(Pet release: Halloween 2010)
Egg based off the pet:

(animal egg # 81 Release: Easter 2019)

"(Unnamed)"
Original pet:

(Pet release: November 2017)
Egg based off the pet:

(animal egg # 82 Release: Easter 2019)

"Unicorn Bat"
Original pet:

(Pet release: Halloween 2013)
Egg based off the pet:

(animal egg # 83 Release: Easter 2019)

"Coraline Bunny"
Original pet:

(Pet release: Christmas 2013)
Egg based off the pet:

(animal egg # 84 Release: Easter 2019)

Footnotes and special thanks
Special thanks to DragonWizardfor making the past Pet to Egg threads. They also worked on the "Pet to Bunny" charts for Easter events. Thank you for making those threads for the community, your contributions are amazing.
Again, VERY special thanks to NightFlame22for documenting a LARGE majority of the "Pet to Egg" documentations for me to place in this post. It really helps a lot, thank you again for your contribution for this thread!
SPECIAL thanks to NightFlame22 for documenting this! <3
NightFlame22 put this all together in a PM while I was managing other documentations.

Due to the popularity of the Eggs based off of pets that are released every year in Easter; they now have a separate section of this thread. They're listed in order of the Animal egg number. Dates are included to help identification. Some of the pets currently do NOT have an 'official' name, but are described to help pet identification.

"Pink Balloon"
Original pet:
(Pet release: August 2008)
Egg based off the pet:

(Animal egg #1, Easter 2009)

"Yellow Toxic"
Original pet:
(Pet release: August 2008)
Egg based off the pet:

(Animal egg #2, Easter 2009)

"Floppy Pink Pastel"
Original pet:
(Pet release: November 2008)
Egg based off the pet:

(Animal egg #3, Easter 2009)

"Light-spotted Blue Leopard"
Original pet:
(Pet release: January 2009)
Egg based off the pet:

(Animal egg #4 )

"Sun Cinnamon Dog"
Original pet:
(Pet release: March 2010)
Egg based off the pet:

(Animal egg #5; Released: Easter 2010)

"Black Yin-Yang Dog"
Original pet:
(Pet release: October 2009)
Egg based off the pet:

(Animal egg #6; Released: Easter 2010)

"Good PPS"
Original pet:
Egg based off the pet:

(Pet from August 2009, animal egg #7)

"Evil PPS"
Original pet:
Egg based off the pet:

(Pet from August 2009, animal egg #8)

"Mime PPS"
Original pet:
Egg based off the pet:

(Pet from May 2009, animal egg #9)

"Bright Green Jelly Dog"
Original pet:
Egg based off the pet:

(Pet from March 2010, animal egg #10)

"Ocean Shima Butterfly Wolf"
Original pet:
Egg based off the pet:

(Pet from November 2009, animal egg #11)

"Dark Leopard Butterfly Wolf"
Original pet:
Egg based off the pet:

(Pet from October 2009, animal egg #12)

"Paztec Shima Swirl"
Original pet:
Egg based off the pet:

(Pet from September 2010, animal egg #13)

"Pink Rave Butterfly Wolf"
Original pet:
Egg based off the pet:

(Pet from December 2009, animal egg #14)

"Growing Null Dog"
Original pet:
Egg based off the pet:

(Pet from February 2010, animal egg #15)

"Daybreak Lullaby Dog"
Original pet:
Egg based off the pet:

(Pet from May 2010, animal egg #16)

"Brown Heartwood Dog"
Original pet:
Egg based off the pet:

(Pet from May 2010, animal egg #17)

"Teal Mausaic"
Original pet:
Egg based off the pet:

(Pet from September 2010, animal egg #18)

"Purple Llama Swirl"
Original pet:
Egg based off the pet:

(Pet from September 2011, animal egg #19)

"Red Tiger Butterfly Wolf"
Original pet:
Egg based off the pet:

(Pet from January 2011, animal egg #20)

"Green 3rd Gen Dog"
Original pet:
Egg based off the pet:

(Pet from January 2011, animal egg #21)

"Headphone Subwoofer"
Original pet:
(Pet release: June 2011)
Egg based off the pet:

(Pet from June 2011, animal egg #22)

"Tiger Wild Dog"
Original pet:
Egg based off the pet:

(Pet from July 2011, animal egg #23)

"Brown Blue Tribal Dog"
Original pet:
Egg based off the pet:

(Pet from September 2011, animal egg #24)

"Growing Black Rose Dog"
Original pet:
Egg based off the pet:

(Pet from December 2011, animal egg #25)

"Floppy Choco Sun Dog"
Original pet:
Egg based off the pet:

(Pet from February 2012, animal egg #26)

"Green Bubble Dog"
Original pet:
Egg based off the pet:

(Pet from January 2012, animal egg #27)

"Flop-Eared Pirate Dog"
Original pet:
Egg based off the pet:

(Pet from January 2011, animal egg #28)

"Flop-Eared Sea Glass Dog"
Original pet:
Egg based off the pet:

(Pet from July 2012, animal egg #29)

"Blue-Eyed Pixel Dog"
Original pet:
Egg based off the pet:

(Pet from December 2012, animal egg #30)

"Red-Marked Grey Chia Dog"
Original pet:
Egg based off the pet:

(Pet from December 2012, animal egg #31)

"Brown Salmon Null 2nd Gen"
Original pet:
Egg based off the pet:

(Pet from November 2012, animal egg #32)

"Green Greenpaw Dog"
Original pet:
Egg based off the pet:

(Pet from October 2012, animal egg #33)

"White Paint Cat"
Original pet:
Egg based off the pet:

(Pet from January 2013, animal egg #34)

"(Unnamed)"
Original pet:
Egg based off the pet:

(Pet from November 2012, #35)

"Blue Alien Cat"
Original pet:
Egg based off the pet:

(Pet from December 2011, animal egg #36)

"Mint Toothpaste Butterfly Wolf"
Original pet:
Egg based off the pet:

(Pet from October 2012, animal egg #37)

"Red Alien-Eyed Cat"
Original pet:
Egg based off the pet:

(Pet from January 2012, animal egg #38)

"Bob-Tailed Swamp Dog"
Original pet:
Egg based off the pet:

(Pet from June 2013, animal egg #39)

"SoulWings Sun Dog"
Original pet:
Egg based off the pet:

(Pet from August 2013, animal egg #40)

"Collar Galaxy Second Gen"
Original pet:
Egg based off the pet:

(Pet from January 2014, animal egg #41)

"Turquoise Crystal Dog"
Original pet:
Egg based off the pet:

(Pet from May 2013, animal egg #42)

"Salmon Smile 2nd Gen"
Original pet:
Egg based off the pet:

(Pet from July 2013, animal egg #43)

"Brown Stitch Cat"
Original pet:
Egg based off the pet:

(Pet from May 2013, animal egg #44)

"Silver Coin Cat"
Original pet:
Egg based off the pet:

(Pet from February 2014, animal egg #45)

"Fire 2013 Butterfly Wolf"
Original pet:
Egg based off the pet:

(Pet from June 2013, animal egg #46)

"Purple Banded Butterfly Wolf"
Original pet:
Egg based off the pet:

(Pet from October 2013, animal egg #47)

"(Unnamed)"
Original pet:
Egg based off the pet:

(Pet from January 2014, animal egg #48)

"Pointy Two-Tailed Tricolor Dog"
Original pet:
Egg based off the pet:

(Pet from May 2014, animal egg #49)

"Teal Rainbow Stripe Cat"
Original pet:
Egg based off the pet:

(Pet from May 2014, animal egg #50)

"(Unnamed)"
Original pet:
Egg based off the pet:

(Pet from June 2014, animal egg #51)

"Flaming Rainbow Dog"
Original pet:
Egg based off the pet:

(Pet from July 2014, animal egg #52)

"(Unnamed)"
Original pet:
Egg based off the pet:

(Pet from August 2014, animal egg #53)

"Olive Pizza Cat"
Original pet:
Egg based off the pet:

(Pet from September 2014, animal egg #54)

"(Unnamed)"
Original pet:
(Pet Release: December 2015)
Egg based off the pet:

(Animal egg #55; Release: Easter 2016)

"(Unnamed)"
Original pet:
Egg based off the pet:

(Animal egg #56; Release: Easter 2016)

"Sakura Store Dog"
Original pet:
(Pet Release: Store pet 2014)
Egg based off the pet:

(Animal egg #57; Release: Easter 2016)

"Blue Morality Moon Dog"
Original pet:
Egg based off the pet:

(Pet from January 2016, animal egg #58)

"Good/Bad Blanket Cat"
Original pet:
Egg based off the pet:

(Pet from Christmas 2013, animal egg #59)

"Snowy Night Bunny"
Original pet:
Egg based off the pet:

(Pet from Easter 2011, animal egg #60)

"Dark Pink Shima Butterfly Wolf"
Original pet:
Egg based off the pet:

(Pet from June 2009, animal egg #61)

"(Unnamed)"
Original pet:
Egg based off the pet:

(Pet from Valentine's Day 2016, animal egg #62)

"Dark Paint Splatter Cat"
Original pet:
Egg based off the pet:

(Pet from July 2015, animal egg #63)

"Unnamed"
Original pet:
Egg based off the pet:

(Pet from December 2016, animal egg #64)

"Unnamed"
Original pet:
Egg based off the pet:

(Pet from CS birthday 2012, animal egg #65)

"Unnamed"
Original pet:
Egg based off the pet:

(Pet from March 2017, animal egg #66)

"(Unnamed)"
Original pet:
Egg based off the pet:

(pet from 2015 Easter event, animal egg #67)

"(Unnamed)"
Original pet:
Items based off the pet:

(Pet from November 2016, animal egg #68)

"(Unnamed)"
Original pet:
Egg based off the pet:

(Pet from 2016 Space event, animal egg #69)

"(Unnamed)"
Original pet:
Egg based off the pet:

(pet from January 2016, animal egg #70)

"(Unnamed)"
Original pet:
(Pet release: December 2017)
Egg based off the pet:

(animal egg # 71 Release: Easter 2018)

"(Unnamed)"
Original pet:
(Pet release: Easter 2017)
Egg based off the pet:

(animal egg # 72 Release: Easter 2018)

"(Unnamed)"
Original pet:
(Pet release: July 2017)
Egg based off the pet:

(animal egg #73 Release: Easter 2018)

"Blue Beach Event Squid"
Original pet:
(Pet release: Beach Event 2012)
Egg based off the pet:

(animal egg #74)

"Unnamed"
Original pet:
(Pet release: January 2018)
Egg based off the pet:

(animal egg #75)

"Unnamed"
Original pet:
(Pet release: Easter 2011)
Egg based off the pet:

(animal egg #76 Release: Easter 2018)

"(Unnamed)"
Original pet:
(Pet release: July 2016)
Egg based off the pet:

(animal egg #77 Release: Easter 2019)

"(Unnamed)"
Original pet:
(Pet release: January 2016)
Egg based off the pet:

(animal egg #78 Release: Easter 2019)

"Spirit Cat"
Original pet:
(Pet release: Halloween 2015)
Egg based off the pet:

(animal egg #79 Release: Easter 2019)

"Unnamed"
Original pet:
(Pet release: August 2013)
Egg based off the pet:

(animal egg #80 Release: Easter 2019)

"Star Bat"
Original pet:
(Pet release: Halloween 2010)
Egg based off the pet:

(animal egg # 81 Release: Easter 2019)

"(Unnamed)"
Original pet:
(Pet release: November 2017)
Egg based off the pet:

(animal egg # 82 Release: Easter 2019)

"Unicorn Bat"
Original pet:
(Pet release: Halloween 2013)
Egg based off the pet:

(animal egg # 83 Release: Easter 2019)

"Coraline Bunny"
Original pet:
(Pet release: Christmas 2013)
Egg based off the pet:

(animal egg # 84 Release: Easter 2019)

Footnotes and special thanks
Special thanks to DragonWizardfor making the past Pet to Egg threads. They also worked on the "Pet to Bunny" charts for Easter events. Thank you for making those threads for the community, your contributions are amazing.
Again, VERY special thanks to NightFlame22for documenting a LARGE majority of the "Pet to Egg" documentations for me to place in this post. It really helps a lot, thank you again for your contribution for this thread!