Amanda Graham is an author and illustrator of over 100 books, many for the educational market. Her debut, Arthur (1984), won the UK Children’s Federation Award and was CBCA-shortlisted. She now writes, illustrates, and teaches in the Adelaide Hills, South Australia.
All Arthur the dog wants is to find his forever home, but no one coming into the pet store seems to want him. He sees someone buy a snake, so he pretends to be a snake. He imitates the various animals in the shop, until his antics draw attention and he finds his happily ever after. This is a totally heart-warming story about being yourself. Love it!
(Apparently this is also titled Who wants Arthur, but I've only ever seen the just "Arthur" editions). Who Wants Arthur?