No support at all, would prefer CS do away with the delete feature altogether. There's plenty of ways to get rid of unwanted pets as it is.
*Edit* Although, I think a reform to the pound could see donating not requiring a response from the other end other than an 'are you sure?' final confirmation before you send pets there. That way donating could be immediate, rather than worrying that you've already set to donate pets in another trade that could be canceled.
The pound isn't really a user anyway, so I don't see why it should need someone logging in to accept pets.