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My puppy has a soft bump on its head that turned hard. What is it?

Updated On September 23rd, 2025

Pet's info: Dog | Great Dane | Female | unspayed | 5 months and 23 days old | 75 lbs

My 5 month puppy has a knot on top of her head (not the back skull bone) that showed up 5 days ago. At first it felt soft and fluid filled. We iced it and gave her baby aspirin. It hasn't shrunk and feels harder. We have a vet appointment tomorrow but I want to know if it's permanent or possibly more severe. We waited to see if it was just a bruise that would go down.

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1 Answer

Most Helpful Answer

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Answered By Lauren Jones VMD

Veterinarian

Published on June 14th, 2017

One of the most common causes of these harder swellings, particularly in rambunctious puppies, is a subperiosteal hematoma (aka "coffee table bump"). The vet will likely recommend skull x-rays for Nala to assure that there is no damage to the bones of the skull. If a subperiosteal hematoma is diagnosed, these fortunately tend to improve over time without any significant intervention. In the future, avoid using aspirin in Nala because it can cause bleeding issues and stomach ulcers in dogs. If Nala needs pain medications, her vet will be able to prescribe safer alternatives. I hope that all goes well!

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