My dog has a hard lump in her mouth. Is it cancer or a tooth problem?
Updated On September 23rd, 2025
Pet's info: Dog | Boxer | Female | unspayed | 10 years and 9 months old | 65 lbs
My dog has a hard big lump inside her mouth on the left side on the picture you can see it. Is this cancer? Or tooth issue?
4 Answers
Most Helpful Answer
Published on January 15th, 2020
That looks like a mass. Sometimes these are benign and sometimes they are not. Eva needs to have this mass removed to be tested but she likely cannot chew normally because this mass is growing over her teeth. Make an appointment. I hope this helps.
5Pet Parents found this answer helpful
Related Answers from Veterinarians
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Published on October 12th, 2017
I would suggest a vet visit for Andie. He could have an abscess, enlarged lymph node, tumor, cyst or swollen salivary gland. But there is no way to know without an exam. After a physical exam the vet may aspirate the mass to see what is in the mass and that may be enough to diagnose it. Thanks for using Petco Pet Education Center, formerly Petcoach
1Pet Parents found this answer helpful
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Published on September 13th, 2017
I am sorry to hear about Tobs! Luckily I do not think this is an emergency situation so I wouldn't worry about not being able to get him in to the vet tonight. This appears to be an oral mass or tumor. We can have tumors in the mouth that are benign (meaning they do not behave aggressively/don't spread elsewhere or cause issues) or malignant (aggressive cancers that can invade locally or spread elsewhere in the body). Unfortunately with most there is no way to tell just by looking at them. We will sometimes recommend an aspirate of the mass to try to collect cells for identification, or sometimes just remove the mass and send it off for pathology. You can read more about oral masses at http://www.veterinarypartner.com/Content.plx?P=A&S=0&C=0&A=130. It is possible the mass was much smaller and he hit or rubbed it causing some swelling/internal bleeding leading it to increase rapidly in size and perhaps this is why you didn't notice it earlier.
1Pet Parents found this answer helpful
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Published on March 28th, 2019
I would contact them again to see if they have any urgent appointment for biopsy as this does indeed look quite concerning and could be significantly worse in a month. Growths in the mouth are at high risk for being tumours and although treatment options are limited, early diagnosis improves the chance for succesful treatment - referral to an oral surgeon may be worthwhile
1Pet Parents found this answer helpful
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