I am familiar with all types of dogs, especially x-large breeds like mastiffs. I have two very friendly Bullmastiffs at home that love company and love the chance to make new friends. I can take your dog for as long of a walk as it needs and can run with your dog if you'd like. I live in the Strathmore neighborhood next to Onondaga park and the Westcott Reservoir, so your dog will enjoy being in the park playing as much as my dogs do. I am flexible and would love to give your pet the same comfort and attention that you would want your dog to have while you're home. If given the opportunity to take care of your pet, your pet won't even realize that you're gone.