How Can You Tell If Your Dog Is Dehydrated?

How Can You Tell If Your Dog Is Dehydrated? Loss of skin elasticity. Loss of appetite. Vomiting with or without diarrhea. Reduced energy levels and lethargy. Panting. Sunken, dry-looking eyes. Dry nose. Dry, sticky gums. How does a dog act when dehydrated? Loss of appetite, panting, and a dry nose are other signs of dehydration.