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Hello, you are through to Dr Linda, a UK based vet with 10 years of clinical experience.
I'm sorry to hear this and understand your concern for Archie.
Is he being social, going on his walks and eating well?
Would a photo of the lesion be possible please?
Thank you, ok.
This photo is great, thank you.
Is he up to date with his routine booster vaccines?
Great, this makes the risk of Leptospirosis from a rat much less likely.
I suspect he does have an infection and we'd also consider a rupture of a salivary gland and/or lymph node enlargement.
There will also be some bruising and inflammation from the bite itself.
It is important we ensure he is continues to eat and be active and his gums should be pink and wet.
We should bathe the skin with salt water too.
He does need to see a vet so we can examine the lesion, flush it thoroughly and remove any foreign matter that could be in there.
He will likely need prescription medicine including antibiotics and anti inflammatories and the sooner these are started the better.
There is also a chance he would need a drain to be placed.
Typically a drain would be placed under anaesthetic and would stay in for as long as it is productive (usually a few days). Most drains can be removed conscious.
Drains are not always needed and we'd hope he does not require one.
Unfortunately, antibiotics are prescription only and do require an in person vet visit.
Not at all and hopefully Archie is back to normal very soon.