For boarding in my home, I have a home which is roughly 1800 square feet. It has a decently sized backyard for dogs to run and paly in. My dog has a blast back there digging up dirt each chance he gets. There is only one spot on the fence line around the side yard that is somewhat low (a swing gate roughly 4ft). The rest of the fencline is 6ft or higher. A decently athletic dog might jump it if they really wanted though Odin has never tried nor is he coordinated enough to do so. Regardless, I still take care to check on him frequently when I let him into the yard to ensure he doesn't attempt to jump the fence. If other dogs were to be boarded in my house, I would not leave them in the yard without myself being present and observing their actions. My entire bottom floor and stairs are tile and hardwood. There is a baby gate at the top of the stairs where the rest of the house is carpeted, allowing me to control when dogs are allowed and not allowed in that area of the house if they are not potty trained. It is no worry if they have accidents downstairs. I also have a large dog crate if clients prefer their dogs to be crated at any time. There is a small park right in front of my house as well, if clients want their dogs to have more active play time with more freedom to run around on grass I can bring them to the park. I have a 100ft cabled leash that I can plant into the ground to ensure that they can't run into the street. I am a very active person and don't mind taking dogs for runs at clients requests.