He's a papillon breed which is French for 'butterfly' - after their butterfly-shaped ears. They're generally small.
But Dylan's so tiny he can't even wear a collar - they just slip right off!
He was reared on baby rusks and milk. Vets didn't expect him to survive after his mum nearly squashed him.
Now he eats two teaspoons of chicken and rice for each meal from a budgie's dish!
Dylan's owner Barbara Jones said: "Everyone who meets him wants to pop him in their pocket and take him home!"
He lives in Barnstaple in Devon with five other dogs and a cat.
"Dylan is the boss", said Barbara. "The cat just flops around after him."