I am wondering why my once sweet puppy has turned into a jealous dog (he's a 1 yr old yorkie). I have a cat and he plays with her all day but when shes cuddling with me he gets jealous and attacks her. He has started doing that with other dogs too, and he knows the dog so im not sure why all of a sudden hes this vicious little beast. Not sure what to do. I dont like aggressive animals. :/
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