The short version
- It is often silent until it ruptures, which is why it is usually caught late.
- With surgery alone, median survival is measured in months, not years; adding chemotherapy roughly doubles it. Stage is the biggest driver.
- No single treatment cures it today. The most promising results come from combining approaches.
- Full detail, with sources, is in the guides below. Start at the top if you were just diagnosed.
Understand the disease
The silent killer
What hemangiosarcoma is, why the spleen and heart are common sites, and what the survival numbers really say.
Survival after a splenectomy
How long after the spleen is removed, from one study of 208 dogs, and what a median really means.
What blood tests can and can't do
New liquid-biopsy screening tests, what the peer-reviewed data shows, and the honest catch about early detection.
Weigh the treatment options
Why immunotherapy changes the math
Where chemotherapy hits a ceiling, and why teaching the immune system to help can produce long-term survivors.
The cancer-vaccine scoreboard
Every dog cancer vaccine, graded by the strength of its evidence, from proven to disproven. Read the tier, not the headline.
Beyond vaccines
Checkpoint drugs, precision therapy, targeted toxins, and why the best results come from combinations.
Personalized vs. shared-antigen vaccines
The two families of cancer vaccine, how they differ, and what the evidence says about each.
Understand the personalized approach
How personalized cancer vaccines work
A plain-language walkthrough of how a vaccine is built from a single dog's own tumor.
The missing chapter
Personalized neoantigen vaccines, the human proof they can work, and an honest look at why hemangiosarcoma is a hard case.
Protect your options
About RosieVaccine
We build personalized mRNA cancer vaccines for dogs.
We are a research-stage vaccine design service in closed beta, overseen by veterinarians. There is no licensed product and nothing to purchase. If you want to follow the work or explore a research collaboration, you can register your interest.
Register research interest → Read the evidence →Important
This guide is for general educational purposes only. It is not veterinary medical advice, and it is not a claim of clinical efficacy for any treatment. RosieVaccine is a research-stage design service; there is no licensed or available product. Survival statistics are population results and do not predict any individual dog's outcome. Do not start, stop, or change your dog's care based on this guide. Every decision belongs with a licensed veterinary oncologist who has examined your dog.