There are many breeds of large dogs with docile and intelligent personalities. Here are some recommendations:

Labrador Retriever: This kind of dog has a gentle, lively personality, a very high IQ, and is friendly to people. Makes great family pets.

Golden Retrievers: Golden Retrievers are generally very loyal, gentle, and kind, making them suitable not only as family pets but also as emotional support animals.

Bernese Mountain Dog: The Bernese Mountain Dog is loyal to its owner, has strong obedience, and is friendly to children. It is a good family companion.

Saint Bernard: This dog has a docile personality, is easy to get close to, and is tolerant to children. It is a good family pet.

Border Collie: Widely regarded as one of the most intelligent dogs, Border Collies are great for training and competition, as well as making excellent family pets.

Great Dane: The Great Dane is tall, loyal to its owner, has good obedience and has a quiet personality. It is a very popular large dog breed.