I've dog sat for family & friends for years. Big dogs mostly. Family history breeding dogs. Have 2 dogs currently, a boxer and a boston. I'm comfortable with almost any dog, mild tempers aren't a big deal. If a dog bites or snarles, that can be an issue. Doesn't make a difference if your dog doesn't know sit, stay, lay down etc as long as they're friendly. I know most dog parks in the city if your dog likes that, having dogs and growing up here Ive been around.