When you "name" release a pet, it will not release unless you are able to control it. The release command should not do a check, it should just allow you to release the animal. Currently, the only way to release is to click on it and hit release, which I find very weird. Also, "all release" should release all pets.
Currently you cannot rename a pet by adding a letter to the end of it. If I try to rename a bull "a bullz" it says it is unacceptable.