I would not recommend Pet Armor. We bought it for our small dog. Within 1 day of applying Pet Armor, our dog started scratching constantly, biting at his feet, scratching so much that he has a large bare spot at least 1 1/2″ diameter from scratching so bad on his neck, along with bumps all over the application spot. He was extremely distressed. I thought it was just fleas and the medicine not working, until he kept getting worse, and he was raw and bleeding. I will NEVER use this product again. He has done better the last night after I washed him very well and gave him benadryl. It looks like we poured acid on his poor body.
I would highly recommend that you do a very small test spot before applying the full application on your dog. We’ve always used Frontline Plus in the past, and NEVER had this problem. I don’t know, maybe our dog has a skin allergy to something in Pet Armor, but I wanted to let others know of this possibility.