My dog has a sudden red lump under its jaw. When to see a vet?
Updated On September 23rd, 2025
Pet's info: Dog | Parson Russell Terrier | Female | spayed | 8 years and 9 months old | 8 lbs
Found a penny sized red lump under dogs jaw. Wasn't there this morning. When should I get it checked out?
4 Answers
Most Helpful Answer
Published on July 5th, 2017
Thank you for the pictures. I wouldn't rush Topsy into the emergency clinic, but I would recommend having this evaluated sooner rather than later (next day or two). It is hard to tell from the pictures if it is skin related or more involved. Some possibilities include skin irritation from something that she came in contact with, an insect bite, possibly tooth related, or maybe a foreign body. If she will allow you you can lift her tongue and look around her lips to see if you can see any potential source of irritation. If she will not allow you, or the lump seems to be uncomfortable to her then I wouldn't push her and definitely have her evaluated by a veterinarian. I hope this gives you some direction. I am available for consultations if you have further questions or concerns. Feel better soon Topsy!
1Pet Parents found this answer helpful
Related Answers from Veterinarians
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Published on June 7th, 2018
Oh dear! Poor girl. I'm afraid this does look very suspicious for some type of oral tumor, such as an oral melanoma or squamous cell carcinoma. A biopsy will be needed to get a definite diagnosis, so I would recommend taking her to the vet to have this checked as soon as you are able to. Surgery to remove the tumor as well as other treatment such as radiation or chemotherapy may be recommended, depending on the diagnosis.
1Pet Parents found this answer helpful
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Published on August 17th, 2018
Thank you for submitting your question regarding Nashville. It is a little difficult to tell, but it does look like a small mass as opposed to a wound. Young dogs can develop a benign growth known as a histiocytoma that will spontaneously regress on its own in several months. Unfortunately, there is a cancerous growth called the mast cell tumor that can have a similar appearance. The veterinarian is able to differentiate by looking at cells under the microscope. You will what to have her evaluated especially if the bump enlarges. I hope this information helps!
1Pet Parents found this answer helpful
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Published on June 23rd, 2017
These bumps look like benign adenomas but without doing a cytology I cannot say for sure that they are benign. There are other types of masses that could look similar like histiocytomas (benign) and mast cell tumor (malignant). Watch them closely - if they grow, change, or if she is bothered by them, I would recommend to see your vet so they can look under the microscope to see what type of tumors they are. I hope this helps!
1Pet Parents found this answer helpful
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