Your dog’s feet. Do you know if their front feet are smaller or larger than their back feet? (by all means, go look!)
Hind feet of Dachshunds, for example, are said to be smaller than their front feet. Why do you suppose?
If you answered that it’s to move earth, you’d be right! Big front paws scoop up earth, smaller back paws don’t block the earth that’s being flung back, and for good measure, those smaller back feet provide better maneuverability because in a tunnel, Dachshies need to be able to back up quickly!
Long Haired Dachshund by Paul Doyle