Hello I have an 11 month old male cat, black and white and a 10 month old female all grey except for her pawns front and back are white. Then there is my 10 month old Chihuahua chocolate, beige and white, who thinks he is a cat. I talked to my vet and he told me it is because he has never been around another dog. He uses the litter box and eat cat food inbetween his own dog food. It took a long time for me to find a food that puppy would even eat.