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My senior dog's lump changed. Is it serious or affecting behavior?

Updated on September 23rd, 2025

Pet's info: Dog | Staffordshire Bull Terrier | Female | spayed | 25 lbs

So, i sent pictures of a lump that had developed on my dog overnight the other day. She already had a small pink lump in that are which shes had for years but fluid developed behind it. Yesterday the fluid had mostly gone, but today the are is inflated again, but its more firm. Any ideas what is causing this? And if this is to be serious, would my dogs behaviour change? As she has been the same happy dog she always is. She is 12 years old by the way.

1 Answer

Most Helpful Answer

Angel Alvarado, LVT

Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on June 3rd, 2018

As stated by Dr. Orioles, Kelsey should, ideally, be examined by your veterinarian. A fine needle aspirate would be needed to possibly diagnose the lumps and the cause. In a senior pet, infection or cancer are always concerns in regards to rapidly developing lumps or cyts.
If the lumps were to cause discomfort or be infection, you may see a behavioral change in Kelsey. This would possibly include lethargy, lameness or loss of appetite.
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