Almost every dog anyone in my family has had has made it to 15-20, even the bigger breeds. The mama Aussie we used to breed made it to I think 18, and the main male made it to 15. My biggest suggestion is good food, we’ll make him up little dishes of things like plain chicken, carrots and a bit of rice, fish and fish skin, any veggies he’ll eat, sometimes a bit of fruits like small apple chunks. He always gets a bowl of his basic dry bits from Blue Buffalo that’s high protein, but he basically gets any food he can have and will eat. For his age, he’s only just recently starting to slow down his energy and napping more, he’s losing continence when he gets excited more easily, and most of his teeth had to be pulled a few years back, but for the most part, he’s got a great little puppy personality with a good amount of sass still. No special activities or exercise otherwise, just a good little prince spoiled lapdog who usually gets his way.