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(in dogs) an abnormal increase in the thickness of the foot pads: one of the clinical signs of canine distemper
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
hard pad[′härd ‚pad]
A disease of dogs, probably associated with the canine distemper virus; often characterized by encephalitis and hardening of the foot pads.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.