Valencia Vet

Abdominal Lump After Spay Surgery. A seroma appears as swelling at the surgical site, and this can occur during the recuperation period that follows any surgical procedure. You may find a lump on your dog’s abdomen near the incision line.

It's best to take her in for a check up just to make sure that's what this is though. The lump on your pet’s belly is actually the bulging organ. Your pet can get a hernia either because of surgical complications or because she was too active during her recovery.