I own a small dog and medium dog which I take care of. Both dogs are very well trained and we have never had a problem with them biting nor fighting other dogs. I play tennis competively so I can run with your dogs for quite some time. We have a couch for the dogs so if your dog is high-maintenance there shouldn't be a problem. We have a tennis court too for the dogs that like to chase balls around indefinitely. My brother and I take our dogs to Eisenhower park very often. We have taken care of many dogs throughout the years ranging from a 6month old to a 16 year old blind and deaf dog with arthritis. We welcome dogs of all shapes and sizes.