I used to give my Jack Russell a 25 mg tablet of Benadryl for her sinus issues. That's a regular size dose for an adult human, and the recommended dose for her by her vet. She was sleepy but not coma-like!

It didn't work for her sinuses, really. We never figured out why she had gobs of snot every day.

My dad gives his Jack Russell doggie vitamins and that helps her skin. Also, I've heard that Omega-3s are good for their skin, too.

Karen