Here is a question from one of our customers:
Q: I have a large germanshepard that chews all his hair off. We have taken him to vet after vet. Changed his food and everything we can think of. Do you have any crystals that may help him?
Any crystal can be used on pets just as you would a human. Pets love crystals. I as a regular routine stroke my cat with a double treminated clear quartz. When they have had enough they will get up and leave. Now to cover the specific issue you mentioned, the two I would recommend for the symptom of hair loss is Diamond and Moonstone. For the condition of the skin their in the following list. Feel free to use your intuition to chose the one you feel will work.
Dolomite-builds skin and nails
Gypsum-renew and enhance (elixir)
Jade-soothe and smooth skin
Moss Agate-topical treatment (elixir)
Dont be afraid to try different stones on your pets, they will tell you what is good and what isnt worling.