Petco Text Logo
Petco Pet Logo

My dog has a lump that's grown in a week. Should I see a vet?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed | Male | 20 lbs

Hi are you able to tell me what this is? My dog has had it for a week now and it’s grown

This question includes photos that may contain sensitive content. Click to view.

View more to consider that the photos may include sensitive content.

5 Answers

Most Helpful Answer

Image profile

Answered By David Elbeze, DVM, MRCVS

Veterinarian

Published on March 10th, 2018

This lump needs to be checked and analysed as there are many conditions and types of tumors that could look like that. take Archie to the vet, they will perform a fine needle aspiration on the growth and send it to the lab for analysis. when the result comes, the vet will advise what needs to be done according to the diagnosis.

Vote icon

1Pet Parents found this answer helpful

Related Answers from Veterinarians

  • Image profile

    Answered By David Elbeze, DVM, MRCVS

    Veterinarian

    Published on March 31st, 2017

    Any growth needs to be checked and analysed as there are many conditions and types of tumors that could look like that. take Coco to the vet, they will perform a fine needle aspiration on the growth and send it to the lab for analysis. when the result comes, the vet will advise what needs to be done according to the diagnosis.

    Vote icon

    1Pet Parents found this answer helpful

  • Image profile

    Answered By Dr. Heidi DVM, CVA, CCRT, CVTP, CVSMT, CVCH

    Veterinarian, Certified Veterinary Acupuncturist, Certified Canine Rehabilitation Practitioner

    Published on January 19th, 2018

    Anytime a new mass is noticed, I always recommend having it evaluated to see what it is and if anything needs to be done about it. Unfortunately, we can't tell anything about a mass by just looking at it. Even when it feels like a lipoma, it can sometimes fool us. Your vet can perform a simple test called a fine needle aspirate where they use a small needle to collect some cells from the mass, then look at them under the microscope. They may even need to send the cells to the lab for a pathologist to examine them, so we know what the mass is. If it is benign lipoma, you might not need to do anything about the mass at all, but if they see cells that worry them, they might recommend removing the mass. It is common for lipomas to grow slowly over time, but they should always be re-examined if they are growing quickly or changing texture. Good luck! I hope that was helpful. Thanks for using Petco Pet Education Center, formerly Petcoach.

    Vote icon

    1Pet Parents found this answer helpful

  • Image profile

    Answered By Daniel Fonza, DVM

    Veterinarian

    Published on November 27th, 2017

    Hi there and thank you for using Pet Coach to address your concerns. From the picture and your description, I would be concerned about this mass being cancerous. If your veterinarian has not done any testing on this mass I would suggest having this done. A test called a fine needle aspiration can be done to help better determine what the mass could be. This test entails the vet inserting a small needle into the mass and looking at the cells under the microscope to help determine what the mass could be. With its appearance and the fact that it has fluctuated in size, I am concerned about this being a cancerous tumor such as a mast cell tumor. I hope this helps! Please let me know if you have any other questions or concerns.

    Vote icon

    1Pet Parents found this answer helpful

  • Image profile

    Answered By Destini R. Holloway, DVM

    Veterinarian

    Published on July 3rd, 2017

    I am not sure where on the body this is located, however because of the color of this mass I would be concerned that it could be cancerous, especially if it has been a persistent mass for more than a week or two. I would highly recommend taking Buffy in to your vet to have this mass removed and sent off for analysis so that it is properly identified so that we know if this is definitively cancer or not. I hope Buffy is ok and also that you are able to get good results on this mass. Best wishes and take care.

    Vote icon

    2Pet Parents found this answer helpful

See More Answers
image
Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Sponsored