Petco Text Logo
Petco Pet Logo

Can a dog's tumor shrink and grow? Do cancer symptoms fluctuate?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Small (up to 22lb) | Female | 9 years old | 5 lbs

part 2. peanut in my care on day 3 was totally herself day 4 no signs of "cancer" her symptoms GONE neighbor said her ill condition comes and goes...lasting 2 days or 5 days. QUESTION does cancer do this? her tumor is back to original size, shes not bloated now. I'm thinking neglect lack of water etc. I saw similar symptoms(not parallel w/cancer Sym) in other dog. she licked tumor raw but it healed in one day after I covered it. she loves food takes walk, no problems now. stres/neglect?

1 Answer

Most Helpful Answer

Image profile

Answered By Rebecca, DVM

Veterinarian

Published on September 3rd, 2017

Hi we cannot see previous questions that you have posted on Petco Pet Education Center, formerly Petcoach. If you have a more complex case feel free to set up a consultation with myself or one of the other experts. But I'll do my best to answer the question do you have here. There are some tumors or cancerous masses that may appear to decrease and increase in size such as mast cell tumors or histiocytomas that may spontaneously regress on their own but can recur in other places. Certain medications can also cause tumors to shrink in size but they may regrow ones that medication is not as effective. Depending on the type of cancer and what organ system in the body it is affecting, many dogs live seemingly normal happy lives up until the point they can no longer compensate or the cancer spreads. For many different reasons owners do not always choose to pursue cancer treatment or in some cases it's not possible. But the pet can still live months to years relatively happy. I hope that was some help, if you have further questions feel free to open up a consultation. Thank you for using Petco Pet Education Center, formerly Petcoach.

Vote icon

1Pet Parents found this answer helpful

image
Have A Vet Question?

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

Sponsored