I've been a dog owner myself for 2 years and before that loved to dog sit. I loved dog sitting so much before getting one that I would watch my neighbors dog for free whenever I could. I do have a dog of my own - a 50 lb cattle dog mix. She’s very playful when other dogs are, but will relax if the other dogs do not want to play. I live in a house with a fenced yard and were half a block from a dog park. When I do watch your dog, I'd be sure to have ample time set aside for walks and play time. I would be sure to ask what rules you have about your pet, and follow them. For example, I do let my dog on the furniture, but would be happy to change that rule if you needed.