the berry is useful to feed all the animals or only one? in what becomes the animal that drinks it?

an Infinity Berry can be fed to any pet without it disappearing - the pet gets 100% full from eating it :)

It doesn't change the appearance (or anything other than the hunger level) of the pet that eats it :)

THANK YOU PADDY

It can be stolen by site events and zapped by the zapper too, so if you choose to use it, lock it :)

The Rotten Rogue event was actually disabled recently c: