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Why is my senior dog panting, limping, and has a large growth?

Updated On September 23rd, 2025

We have a 13 year old Husky/Heeler Mix. He has a huge bump on his right side about where his shoulders are, he has had this about 5 months, and he is having more and more trouble walking, now he has started breathing fast and panting at certain times like he is having difficulty breathing. Nothing he does or we do causes him to start panting. It's almost like what he does when he rides in a car.

1 Answer

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on February 7th, 2017

Poor guy! In a senior dog, I would be very concerned that his huge bump is a malignant tumor that has now spread to his lungs causing his problems with breathing. Cancer can also affect his walking. I would have him seen by a vet right away. This bump needs to be diagnosed with a fine needle aspirate to see if he does have a malignant tumor, and x-rays need to be done of his chest to see his heart and lungs. Once the cause of this bump and difficulty breathing and walking is diagnosed, the vet can discuss if there are any treatment options for him.

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