Pudsey the Dog: The Movie (2014) on Netflix

Plot summary

Pudsey has been on his own in London as a lone ranger, looking out only for himself, and he is quite happy that way. Then he meets siblings Molly, George and Tommy. After the children lose their father, their mother Gail moves them to Chuffington-on-Sea, a sleepy village, and Pudsey tags along. The landlord of the house they move into is Mr. Thorne, who keeps a cat named Faustus, and neither the man nor the cat wants a dog in the house. Pudsey settles in with the family, and he comes to see how much he had missed while living on his own.