They are usually kept for pets. They used to hunt small animals like foxes. Terriers sometimes still pick fights with larger dogs. They like to play really rough. Dogs are really smart.
Dogs know things by their smell.
In order for a dog to find their way home it is by their smell. A dog can smell our scent or hear you call their name. Dogs are very easy to train. You can teach your dog many tricks. Yes, they can save people from drowning.