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My name is***** have been a veterinarian for 11 years. I am very sorry to hear that your dog has a mass on his nose. Certainly, mast cell tumors and histocytomas are the first things we think about when we seem masses that grow up quickly and change sizes. I would be very surprised if this mass were a mast cell tumor in a dog of this age.
Unfortunately, the only way to definitively determine what it is, is to either remove it and submit it for histopathology (more expensive) OR do a fine needle aspirate and submit the slides for a cytology reading - this is variable in price based on the lab that the veterinary clinic uses, but is generally much less expensive than the surgical removal with histopathology.
If it is a histocytoma, it should go away on its own within 8-12 weeks. So, it is reasonable to monitor it as long as it is not causing him any discomfort.
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