Why does my dog have a painful, hard lump on his back that's growing?

Question

Small hard knot on my Poodle mix’s back on the right side. Normally his knots pop and release fluid, but this one is solid. When I apply pressure to it, he wants to nip me, which is indicative of pain. There is no hair loss, no discoloration. It has been there for over a month and has only grown just a tad in size. Otherwise, he has energy, and eating/drinking have not been affected. He hasn’t lost any weight. Pet's info: Dog | Mixed Breed Small (up to 22lb) | Male | neutered | 21 lbs

Ricardo Fernandez, DVM · Accepted Answer

Thanks for using Petco Pet Education Center, formerly Petcoach! This could be a benign or malignant growth. This is often differentiated by a test called a fine needle aspirate (FNA) which is a pain free, inexpensive and easy procedure which in most cases will help reach a diagnosis. Sometimes a biopsy is needed for a definitive diagnosis. I recommend that you have him evaluated by your veterinarian for further assessment and treatment. I am really hoping for something benign. Good luck and have a good night!

Why does my dog have a painful, hard lump on his back that's growing?

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