There's some rashes under both the armpits of my dog. Can someone suggest what needs to be done and what could be the possible reasons?

Dr. Kaveri Giriraddi

There can be multiple reasons for these rashes like food allergy, bacterial infection, atopic dermatitis. You can also check for external parasites. It would be best to see a vet and consult with them to find the actual cause behind these rashes and get it treated.