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What is the time frame of a rabbit's life of a tumor in the lung area?

Happy Hopping

Wise Old Thumper


So I took my bun Andi to the vet, and
the doctor examined his body, and discover something abnormal about his heartbeat. So they did the x-ray and said that there is a tumor in his chest area surrounded by his chest bones. His body weight was 2.3KG in 2025, and in May 2026, he was 2.06KG after he has that fight with Bobo da Bun, and today he is at 1.81Kg. So the weight loss is consistent with the diagnosis that he has cancer.

When he was adopted 8.5 year ago from SPCA, SPCA said she was 2 to 6 yr. old. But he is so full of energy that I thought he should be a young bun of less than 1 yr. old, as he goes around for every part of the house and do all sorts of damage non-stop. So there is no way to know his exact age. The tumor is surrounded by the chest bones, so there is no way of removing it, i.e., it's an inoperable tumor, the risk of removing the chest bone and remove that tumor is very high, especially at his age.
The tumor doesn't affect his diet, as his diet is very good, the volume of bunny poo is the same as always, and it's in the goldish yellow color and at regular to large size. And the doctor doesn't know how many months he has.

1) So for those who own a bun w/ a tumor in the lung / chest area, how many months did your bun lives?

2) So my bun is losing weight as the tumor is absorbing the daily nutrient, I read in the Facebook EC forum that they fatten their buns w/ rolled organic oats, and I have done that successfully with my other bun Fudgie and it works. Should I try the same thing?

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Looking back, Andi has done an highly excessive amount of chewing various objects in the house thru out the past 8.5 years compares to all my other rabbits, and during the bonding of Andi with Fudgie back about 6 to 7 years ago, as well as bonding of Andi with Bucky da Bun last year, and the recent bonding of Andi with Bobo da Bun, he actually lick the under side of my stove, and the kitchen cabinet, and when I switch him back to the pen, he then chew the plastic wrapping of my new dishwasher.

The carpet thru out the house is a $14K wool carpet, even the underlay is natural material, it's guarantee even if a small child chew on it, there is no damage, so the chewing of these carpet should be fine by Andi, and shouldn't cause cancer. But due to the damage of the wool carpet by various rabbits, the PC room's carpet has to be covered by some portable highly dense giant carpet, and Andi was chewing on the edge of those carpets. Further, besides the carpet, there are a good no. of objects in the house thru out the years that it is not natural material, and he does a high amount of chewing all these years. I remember I pulled the Celfort 300 foam from the windows on my bed, and well within a short period of time, he hopped on my bed, discovered that piece of foam and did a high amount of chewing on it, in the end, that piece of foam is unusable and he chew off so much. Likewise, objects on my desk, he has in the past, hop on my desk and damaged them.

This is no difference than a human who smoke too much and got lung cancer. So all these chewing of non-natural substances in the past 8.5 year has now come back to haunt him. I have rabbits for 28 years, I've never seen a rabbit that does so much damage in the house.

He's still having his regular diet of lots of hay, pellet, 2 banana coin and blackberries. Clearly blackberries can only stop regular abnormal cancer cell growth. It cannot stop cancer cell growth caused by ingestion and licking of non-natural material.
 
I will say first of all that I have no experience with lung cancer in a bunny, nor have I any particular knowledge of the subject. But I didn't want to just read and ignore, so I will say how sorry I am that you are dealing with this. It must be heartbreaking.

I wouldn't agree with you that there is no difference between a human who smokes too much and your bunny who has chewed numerous things in your house. Cigarette smoke contains numerous known carcinogens, which can cause different types of cancer, mainly by damaging the DNA I believe. Unless you can remember and correctly identify the material that Andi has consumed, then have each analysed to see if it contain dangerous substances, then I would suggest that this is very unlikely to be fact.

The main danger about bunnies eating 'unnatural things' around the house is that it will have a detrimental effect on their digestion, sometimes resulting in a blockage. It appears that Andi's digestion is fine as he eats well and his output looks great. He is losing weight probably as a result of the tumour itself, especially if he is not eating less. It's important too, to consider the time period over when he has lost the weight. Do you have any clues as to when he has lost the weight, eg do you know how much he weighed inbetween May 2026 and now? I don't think it would do any harm to give Andi some oats to try to maintain his weight. Perhaps very slightly and gradually increase his pellets too.

I would be asking your vet if it is possible to diagnose exactly which type of cancer this is. As I understand from your post, it has only been identified as a 'tumour'. I agree it sounds as though it is inoperable, but to be able to have any idea what the prognosis is, it will be necessary to identify what it is exactly. It may be that a CT scan could give you this certainty. Has your vet also done a blood test?
 
I'm sorry to hear of this diagnosis. Cancer can occur for so many reasons, and no matter what lifestyle choices are made to minimise the chances (lung cancer is definitely not exclusive to smokers, for instance).

He is, however a very senior rabbit, so I would be looking at palliative care to keep him as comfortable as possible and maintain his quality of life.

Oats should be fine if introduced slowly and may help reduce the rate of weight loss.

I had a rabbit with only one functional lung from a reasonably young age. He had many dentals over the years, so survived a lot of GAs. There was no further diagnosis on the 'bad' lung as there wasn't anything we could do about it anyway, and it wasn't causing any functional issues. He actually outlived his litter brother / constant companion, who had no health issues. So a bit of TLC and sensible monitoring can make a real difference.
 
I would be asking your vet if it is possible to diagnose exactly which type of cancer this is. As I understand from your post, it has only been identified as a 'tumour'. I agree it sounds as though it is inoperable, but to be able to have any idea what the prognosis is, it will be necessary to identify what it is exactly. It may be that a CT scan could give you this certainty. Has your vet also done a blood test?
as said from what I wrote, the tumour is inside the chest bone. So they can't remove the chest bone, as such, regardless of what type of tumor it is, it's inoperable
 
I had a rabbit with only one functional lung from a reasonably young age. He had many dentals over the years, so survived a lot of GAs. There was no further diagnosis on the 'bad' lung as there wasn't anything we could do about it anyway, and it wasn't causing any functional issues. He actually outlived his litter brother / constant companion, who had no health issues. So a bit of TLC and sensible monitoring can make a real difference.
can you tell from the x-ray if the tumor is in 1 lung only? as I don't totally understand that x-ray. What is the cause of your bun having a bad lung? is it a tumor as well?
 
My bridge bunny Heidi got cancer in the bone in her arm that we learned had already spread to her lungs then other bones . She was an older mini rex. We had a few months with her on palliative care.
 
My
can you tell from the x-ray if the tumor is in 1 lung only? as I don't totally understand that x-ray. What is the cause of your bun having a bad lung? is it a tumor as well?
It was nearly 20 years ago....
The x-rays showed one lung was 'calcified' - solid white mass of nearly the whole lung. It wasn't investigated further as there wasn't much point (with no realistic treatment options), so we never knew what it was. It probably wasn't malignant. Antibiotics had no effect and anything else was too invasive. It didn't seem to cause any issues (including many GAs for dentals) and there were no masses anywhere else. He lived to 9.5 years. Without the x-rays we would never have known there was anything amiss.

Cancers from any primary source seem to metastasise to places like the lungs and bones, so the lungs are often imaged to see if there has been any spread.

I would concentrate on quality of life now - lots of TLC and treat any other symptoms to keep him comfortable.
 
as said from what I wrote, the tumour is inside the chest bone. So they can't remove the chest bone, as such, regardless of what type of tumor it is, it's inoperable
I accept this. Why I was suggesting that if it was possible, you should establish what type of tumour it is. This is because your original question was regarding the time frame. Exactly what the tumour is will have an impact on the probable timeline.
 
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