I've had my share of dogs, from tiny shih-tzu's to a massive Keshond, chow mix. I work in pet retail and frequently help and entertain the dogs sent for dog training. I am very active and can walk your dog as many miles as you'd like, whilst carrying around a collapsible water bowl and food bowl in case we get thirsty or hungry during the walk. I'm extremely comfortable taking care of and amusing dogs of any size, however if it is in home I would prefer to keep them medium and small due to the size of my home and my own animals. I have no issue, if an animal is staying with me, to take them outside for a quick walk to use the bathroom or exercise a bit.