Besides getting into shape, nicely trimmed toe nails are another benefit of regular dog walking. You’ll know your dog is getting enough exercise when you don’t have to trim their toe nails.
The slight abrasion effect of the sidewalk and even dirt or grass surfaces will keep your dogs toe nails trimmed to perfection when your dogs are getting enough leash time.
I walk my big dogs a mile and a half every day, sometimes on sidewalks and sometimes on dirt.
This amount of exercise is sufficient to keep all their nails trimmed except for their dew claws which don’t regularly touch the ground.