Trading Problem, Help?

[HerNameIsAlyss]

Umm...hi!
So, I was trying to make a trade suggestion earlier, and when I tried to send it I was greeted with the message that "one or more of these pets are no longer able to be traded. Please go back and try again."
The thing is there were only pets on my side since I just wanted to see their offer on these pets.
So, can someone tell me if this is a glitch or something. Since I went through my pets and the ones I was offering were still there.
so please can someone tell me what's going on?

[Suki Sue]

Unfortunately I can't help but I just wanted to say, this happens to me as well.