Sakura I think you kind of misunderstood
It is a common thing to give pets on one site for a pet of same value on an other game
Lets take an example :
I can trade here my Magic night star to you (for a relly common pet since gifts are not possible here) and in exchange you give me on ChickenSmoothie a really rare pet for my collection on that game
Am I right about what you wanted to ask Kalista ?
There is no rules against this kind of trades ^^
If I may, if you have pets on my wishlist on CS, we could do trades I am looking for some pets there
But here on gohticat we have to trade pet for pet, you have to know it, but it is just matter of making the values of pets on different sites to match so that no one is fooled
(I am very sorry if my english is not understable >.<)