We don't sell antibiotic ear drops. I use Zymox enzymatic ear drops for chronic ear infections. Allergies can contribute to ear infections. The warm ears make a good breeding ground for infection. I would try Derma-IonX orally to reduce the heat and inflammation in the body which might help also help with the chewing of the paws. Allergies or anxiety would be the more likely reasons for this. To work on allergies I like to give Canine Probiotics and Omega 3,6,9. I advise a cooling diet using fish or turkey as the protein source and only give treats that are compatible with that diet. Junk food can make the situation worse.
Please let us know how you do.