It's crucial you take your dog to a veterinarian immediately.
Here's why:
* Many possibilities: Lumps on the mouth can be caused by things like:
* Infections: Bacterial or fungal
* Tumors: Benign or malignant
* Trauma: Bite wounds, injuries
* Dental disease: Abscesses
* Allergic reactions
* Potentially serious: Some causes of mouth lumps can be serious and even life-threatening if left untreated.
* Professional assessment is needed: A vet can properly examine the lump, run tests (like biopsies), and determine the best course of action.
Don't wait! Get your dog to a veterinarian as soon as possible. They can help you understand what's going on and provide the best possible treatment.