I've got 2 dogs, both pretty large 70 and 85lbs respectively. They both do about the same amount of activity. The 85lb one is a bit younger so definitely does a little more, but probably not enough to really make a difference.

His nails however need to be trimmed manually, they do not get ground down from just walking/running nor the general lunacy that is being a husky mix.

However the other pup, thats a some type of pit-lab mix, I've not once had to trim her nails in the 9 years I've had her.

I'm not 100% sure why, but I can tell you my husky mix's nails are alot thicker than my pit even when considering proportionally to the size of the dog.

I'm on the east coast and often go to DC, their license plate says taxation without representation. Because ya know they don't really get a say in congress despite having a higher population than 2 states.