PAW PAD BURNS
A dog's pads will burn. Painfully discolored (often whitish), blistering burns are most often revealed to owners when these dogs start to limp, hobble, or finally stop walking. But, too often, the problem doesn't become obvious until the next day, when signs like paw-licking, limping and swelling develop. A burned pad - like a bad sunburn - doesn't have to blister and fester to hurt.
Dogs are very stoic. They rarely let us know when things really hurt. When it comes to walks in particular, few energetic dogs are willing to let their humans down.