Dogs are an interesting supplement in street photography. You may know Elliot Erwitt, one of the best known photographers moving on the streets. You may know his book “Dogs”, he dedicated one of his books to this topic.
I consider taking pictures of dog as a part of street photography although many may disagree with me. Dogs are very often grateful topic, people like them. They are also grateful for photographing. Just be aware of barking them 🙂