can arnica harm dogs
1 Never use arnica gels, creams, tinctures around the eyes or mouth area. 2  If your dog or cat is pregnant or lactating do not use arnica;  If you dog or cat is allergic to arnica or related members of the daisy family â Astercaeae/Compositae family (i.e. chamomile, marigolds, etc.), ragweed do not use arnica.