What's this solid, unattached lump on my dog's leg near his knee?
Updated On September 23rd, 2025
Pet's info: Dog | Mixed Breed Large (61lb +) | Male | unneutered | 3 years and 8 months old | 121 lbs
Hi just spotted a lump near my dogs knee cap, when I touched it its solid and doesn't seem to be attached but he wasnt keen on me touching it. Hes a big dog and doesn't show pain.
4 Answers
Most Helpful Answer
Published on February 22nd, 2017
I would have this lump on Jake examined by a vet. It could be a cyst, a benign tumor, or potentially 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 it's cells, and examines the cells on a slide under a microscope. It's usually painless to the animal, and relatively quick to perform. I'd recommend having Jake seen by a vet tomorrow to have the lump examined and diagnose so it can be treated as needed.
1Pet Parents found this answer helpful
Related Answers from Veterinarians
-
Published on January 21st, 2019
From the picture, this could be a benign tumor like a wart, but without seeing Marco in person, I can't say for certain. 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 his vet a call today to make him an appointment. Best of luck.
1Pet Parents found this answer helpful
-
Published on January 1st, 2020
From the photo this looks like either a fluid filled cyst or a mass. If it were an infection it would be painful and inflamed. I recommend a veterinary exam to feel this and perhaps insert a needle in it to look at the cells. From those they can tell you what it is and if it should be removed. Thanks for using Petco Pet Education Center, formerly Petcoach to help you care for Barkley.
2Pet Parents found this answer helpful
-
Published on January 19th, 2019
It's possible that the swelling on Max is a skin tumor and those are generally not painful, even if they are a malignant cancer. Sometimes the joints themselves can swell for various reasons as well. Anytime a pet get a lump/bump, I always recommend to have it checked. Sometimes the vet can tell what it is just by examining it. Sometimes though they need to take a small sample of cells to look under a microscope. Most skin tumors are benign but malignant tumors are possible. Identifying the cells is the only way to know what it is. I hope this helps and please feel free to post any additional questions.
3Pet Parents found this answer helpful
Hi my dog has had this lump on her front right leg for about a month now and out of no were it got very big it is not solid it feels like fluids are inside but also doesn’t seem to bother her but I no it does I need answers so bad
My dog trixi has a lump on her back knee. Shes had it for a while. I haven't noticed it bothering her but I do want to know what it is so if you could help that would be great. She has also been getting sick often for the past few days.
My german shepherd has a lump on his rear knee it is moveable and soft, he is on antibiotics for inflammation of eczema, I have a picture of the lump
I found a lump, it doesn't hurt him to have it touched. It's not really soft nor does it move. He is walking, eat, drinking, and behaving normally. He got bit by a dog on the inside of the same leg a year ago but the lump is on the outside. Should I
Dog has a growth on elbow
My Westie has recently developed a lump/swelling on the side of his back leg near the knee joint. He has not shown any signs of discomfort or any difficulty walking. What could cause this?
1.5 yr old dog, found a flat feeling lump on shoulder last month, seems to be getting larger. What is this lump likely to be?
Kalina has a growth that has appeared on her lower back right leg, below the hock and right above her paw. Almost looks like where a back Dew claw would grow. It appeared 3 days ago and hasn't grown bigger but has became more of scab. She's a fiesty
My dog has had a marble size lump on his knee that that vet has seen and said it was okay however this weekend it has tripled in size and has a dark purple look to it
My dog developed a lump behind his right knee. It's about the size of a quarter and it wasn't there yesterday. He is a three year old neutered blue heeler mix who has had no previous health problems. How likely is it to be lymphoma?
Book an appointment with the pros – our expert vets are here to help.
