Yeah, it's amazing how strong a dog can be when pulling on the leash. Just great to see you rescuing those dogs and caring for them. A dog that size needs a lot of exercise. To save further wear and tear on your own bodies you may need to take them often to a park, throw/fetch stuff and get them puffed out that way, which I'm sure you know more about than fairly new dog owners like my wife and me.We've been Labrador owners for most of the last 50 years. We currently have two yellow males, Bailey is 11 years old, Angus is 10. We rescued Bailey from our local Humane Society 6 years ago and Angus through Seattle Purebred Rescue 18 months ago.
These two will probably be the last ones. At almost 73, I'm not quite strong enough to keep Angus under control if he gets excited. My wife is younger, but much smaller, and she can't control him at all. She has a history of rotator cuff sugery on both shoulders to prove it!
Our little guy is about a quarter of the size of a Lab and can at times be a boisterous handful, so I hear what you are saying
Andrew