My Dog Acts Depressed And Has A Dry Nose On And Off. Can You Help?

The warm , dry or wet nose in dogs are usually misunderstood by the owner. The nose of the dogs can be cool at one time and he may have warm or dry other time.  If you dog is eating, drinking  and exercising well then no need to be worry.
Only long dryness and warm conditions with crust and flakes formation, loss of pigments, cracks, sore and scabs on nose should be examine by the vet.
If your dog has warm and dry nose with following symptoms then he might be ill.

1. General weakness
2. Loss of appetite
3. Loss of weight
4. Lethargy
5. Vomiting
   
6. Diarrhea

If your dog is having any of the above symptoms along with dry and warm nose then visit to vet.

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I would go to the vet. Changing food can cause her to have the runs. A dry warm nose is usually a sign of a fever.