Can be because of various reasons please book an online consultation for the same

A boil under a dog’s foot (paw pad or between toes) is pretty common and usually painful, so gentle but timely care matters Common causes Bacterial infection (often from a small cut or thorn) Interdigital cyst / furunculosis Foreign body (grass awn, splinter) Constant licking (allergy, stress) Hard surfaces / burns Clean the area (very important) Trim hair around the boil Wash 2 times daily with: Diluted povidone-iodine , or Chlorhexidine solution Dry properly after cleaning 2. Warm fomentation Use warm saline water Apply for 5–10 minutes, 2–3 times/day Helps pus drain and reduces pain 3.Topical treatment Apply after cleaning: Mupirocin ointment, or Fusidic acid, or Neomycin + Bacitracin combination 👉 Cover lightly with gauze only if dog keeps licking Contact your veterinarian also for proper diagnosis & care

It needs to be checked before prescribing medications. Kindly get it checked