How long does a dog remember its owner

If the owner treats the dog well it will always remember the owner, so there is a basis for those touching events in movies and TV, I hope all owners can treat their dogs well. Generally speaking, after three months with the owner, the dog will remember the owner and loyal to the owner, but if the owner does not develop a good relationship with the dog, and long-term absence, the dog will only see the owner will feel familiar. Dogs are more loyal than cats, cats have always been more independent animals, even if the owner does not feed it can catch mice, but since dogs are kept in captivity by humans to maintain a close cooperative relationship with humans, the degree of dependence on people than cats, so dogs are more loyal compared to cats.