I think it would be helpful if trades edited themselves, if a pet was already traded. That way, when people went to adopt say three animals from someone on the Adopt board, but someone asked for one of the animals beforehand, and got it, that animal would disappear from the trade you sent. That way, to ensure you got some of the animals, at least, you wouldn't have to send three different trades, and therefore bog down the other persons trades. :3
Thanks for considering!
~D~