Why does my dog have a sudden, hard, large lump near her tail?
Updated On September 23rd, 2025
Pet's info: Dog | Mixed Breed Large (61lb +) | Female | 5 years old | 73 lbs
My dog has a large lump above her tail to the left of her spine. It came up suddenly. It's hard about the size of a kneecap
4 Answers
Most Helpful Answer
Published on July 22nd, 2019
This lump could be a cyst, an abscess, a lipoma, or a growth. Any suspicious lumps should be examined by the vet. The vet can perform a test called a fine needle aspirate on it. To do this, the vet sticks a small needle into the lump to get a sample of its cells, and examines the cells on a slide under a microscope. It's usually painless to the animal, and relatively quick to perform. Once the cause of the lump is diagnosed, the vet can discuss treatment options if needed. Give Rosemary's vet a call to make her an appointment.
28Pet Parents found this answer helpful
Related Answers from Veterinarians
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Published on July 8th, 2017
These lumps look like they're subcutaneous, or under the skin. An abscess or other infection is possible, or they may be skin masses. They could be benign like a lipoma or fatty tumor, or may be something more serious like a sarcoma. I would recommend making an appointment with your veterinarian to have these lumps examined. Your veterinarian might want to take a sample using a small needle to examine under the microscope (called a fine needle aspirate).
10Pet Parents found this answer helpful
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Published on April 11th, 2018
Thanks for using Petco Pet Education Center, formerly Petcoach! This could be a benign or malignant growth. This may even be an abscess. While this should be evaluated, this is not considered an emergency. 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 her evaluated by your veterinarian for further assessment and treatment. I am really hoping for something benign. Good luck and have a good day!
1Pet Parents found this answer helpful
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Published on April 9th, 2019
Oh that's quite large! This could be a cyst, benign tumor, or a malignant tumor. Any suspicious lumps should be examined by the vet. The vet can perform a test called a fine needle aspirate on it. To do this, the vet sticks a small needle into the lump to get a sample of its cells, and examines the cells on a slide under a microscope. It's usually painless to the animal, and relatively quick to perform. Once the cause of the lump is diagnosed, the vet can discuss treatment options if needed. Give Mj's vet a call to make her an appointment. Best of luck.
1Pet Parents found this answer helpful
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