"I heard once that a puppy raised among kittens will grow up thinking it is a cat"

Such identity crises do seem to occur among animals. In 2009, the Cats Protection League was looking for a home for an 'honorary cat', a Jack Russell dog named Chippy who had lived his life among forty cats, coming to believe that he was the same as them. Chippy used a litter tray, played with toy mice and slept with his best feline friend Annie, a black cat. Happily, Chippy was soon adopted by a dog-loving 72-year-old lady.