Hi, I got my first golden pup when he was 8 weeks. I bought him from a bad backyard breeder, which I did not realize at the time, but have since learned my lesson. Other than feeling guilty about giving the creep my money, I know I made the right choice and Wrigley and I are inseparable and I will never leave his side. I spent 2K in vet bills the first 2 months to get rid of every parasite you can think of and worked hard to get him to a normal weight and nutrition level. You name it, he probably had it. He has been back to the vet quite regularly all with good results. The vet says he is clearly healthy, and a good weight. I feed him the best food and homemade snacks or fruits and veggies and a real raw bone here and there. We have a big yard, I exercise him regularly. When I say I exercise him regularly, I mean he gets walked at least 2.5 miles a day, has plenty of play time in the yard, fetch, etc. I am not an athlete or anything, but I am consistent to make sure my pup stays healthy and happy. I can normally tell when he needs a walk to run off some of the crazy puppy energy and I am committed to exercising him daily. I am also trying to improve my daily exercise so I have been upping it a bit recently. Recently I have taken him to a park that has a 3 mile slight incline trail around a lake. He loves it cause he gets to see all of the ducks and geese. I typically walk it twice for a total of 6 miles. I am nowhere in perfect shape and can stand to lose a few pounds. I was sure I would tire way before him. As it turns out, just after the 3 mile mark, he poops out and wants to lay down. He just lays there panting and will not move. I was amazed, I thought these dogs have tireless amounts of energy. I let him rest for 10 mins, and he finally got up, walked another 25 steps or so and wanted to lay down again. He just seemed tired. I tried a couple of more times, but then thought I might not want to push him. I tried again a day later and he did the same thing, just about the same time. Is it that he is use to 2.5 miles and 3 is just too much or in your opinion is something not quite right? It is not hot, I tried water (he does not drink it so I assume it not thirst). For such a young pup (10 mths), I would not think he should tire that easily. I mean he still runs around in the yard and will be active, but obviously he is not walking 3 miles or active for that amount of time. And this is walking-not running. And I am not a speed walker per se. He also will play about 10 rounds of fetch in the yard, but then he lays down and decides he is done. When I take him to the vet, he says he seems perfectly healthy. I believe in instinct and this just puzzles me especially with everything I have read about the breed. I thought I was not going to be able to keep up with his abundance of energy based on what I read about the breed, but I made a commitment to do so. I am just perplexed. I can't decide if I am being over paranoid or if I should truly push back on the vet and pay for the tests. His good health is obviously my main priority so I will pay for what it takes to make sure he is taken care of. I just wonder if I am overly concerned. Obviously, I am going to take him back to the vet. But I was interested in your thoughts, for those who have raised Golden's. Is this normal. Are some just less active then others? What should the vet be testing and looking for? Thanks for your input.