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Hi there, you are through to Dr Linda, a UK based vet.
While there are a few potential causes for this, the most likely cause is impacted anal glands, which may or may not be infected.
A vet needs to assess them and they may need to be expressed.
If there is an infection, she will be started on antibiotics and anti-inflammatories.
No, I cannot think of a scenario where her dental disease would be linked to this.
Oh, I'm very sorry!
I misread and thought you were saying she had a swelling around her anus.
Absolutely, submandibular lymph glands can swell due to dental disease.
We can also see swelling here due to salivary glands which have become enlarged, but this is rarely symmetrical.
If there is an oral infection, this would probably be the culprit.
Cancer would be uncommon at this age and, as we know she has dental disease, this would be much more likely to be the cause.
Those with cancer tend to have other signs such as weight loss, a reduced appetite and nausea.
I agree it is not an emergency. However, if you are concerned and want her seen sooner, it would be worth calling another local vet who may be able to fit you in more promptly.
It may well be that there is an abscess, which could certainly cause swollen lymph nodes as the white blood cells arrive at the site of the infection in an attempt to fight it off.
While I cannot make a diagnosis without examining her, I would not be overly concerned at this point.
I totally understand and I think a lot of people do the same!
Dental disease can cause bad breath, red gums, brown build up on the surface of the teeth, oral swelling, a preference for wet over dry food, drooling etc.
One or both glands can be swollen, depending on where the infection is and how severe it is.
This window will remain open so you are very welcome to keep me posted and to ask any further questions you may have.
Sending her best wishes from London!
Not at all and take care :)