Why Does My Kitten Keep Trying To Dump His Water Dish?

my kitten keeps trying to dump his water dish. what is wrong with him? he has been doing this now for about a week and now i have noticed that it isn’t just the one day its every few days, but more often than that. he is a rescue cat from a shelter so we don’t know if they were abused by someone or if its just something going on in his head.