- Going through old news posts I was actually able to find information about the release/removal of the 2009 store pets (excluding Eat Me/Drink Me, but that's added below as well) and was able to get ranges from there! Please excuse any spelling/grammar errors, it's currently 3 am here.
The first pet adopted in October 2009, the month the first store pets were released according to the archive, is 4394158. According to the 16th November 09 news, that was the last day to buy the Skelebun and Orange Cerb. The last pet adopted on the 16th is 6026922.
I cannot find any news posts related to the Eat Me/Drink Me set, but from looking through a couple of user's collections, it overlaps with the Skelebun/Orange Cerb. More research needed for them - we could also just use the very first October pet as a start for them, but the end of when they were available is unknown. Do they also overlap with the Liontails? Or were they removed when they came out? Were they removed some time before Liontails were released? Could just use the whole range from 1st October 09 - 31st January 10 to make sure they're covered, if no one finds something more specific.
tl;dr - No news about Eat Me/Drink Me. Could just use a very large range going from when store pets were first released to when all 09 store pets were removed.
It looks like the Liontails were released on 21st December 09. The first pet adopted on December 21st is 7466417.
- It seems strange that they're listed first in the archive since, as nickjr said, the other years are listed from first released to last released. It looks like the 2009 Store Pets are listed backwards in the archive - Liontails were the last released.
I'm starting on 2010 now, just wanted to post what I have so far with 2009!
Edit; Here's 2010:
From the February 1st new post linked above, that's when the new set was released - the Seal PPS litter. The first pet adopted in February 2010 is 9155016. The litter was available until April 15th as planned, based on the 2nd April 10 news post. The last pet adopted on April 15th is 13397443.
From the same news post linked above, the next set (Red Cerb + Brown Sleipnir) was released early, on April 2nd - first pet adopted on April 2nd is 12206278. The news post also said they were going to be available 2 months from that day, so June 2nd should be the last day they were available, but the news post on 1st June 10 says that new store pets were released on the 1st. I went to the end of the 2nd to be safe.
From here the rest of 2010 was completely normal on release and removal dates!
- Range for Andriods: 14589928 - 17424126 (14589928 - 17424126)
Range for Punk/Lolita set: 17424127 - 20382822 (17424127 - 20382822)
Range for Patchwork + Raven dogs: 20382823 - 23444153 (20382823 - 23444153)
Range for Clockwork Bun + Marionette: 23444154 - 28192973 (23444154 - 28192973)
I can get the 2011 List Store Pets tomorrow (later today, technically, I guess). Then possibly move onto Non-List Store Pets
Edit; fixed a couple spelling errors lol
Edit; 2011 List Store Pets:
- Range for Arabians + Clydesdale: 28192974 - 32353606 (28192974 - 32353606)
Range for Basilisk set: 32353607 - 37004864 (32353607 - 37004864)
Here's all the List Store Pets! Working on the off-list ones now c: