10/08/2026
Does Castration Really Increase Cancer Risk?
âDonât castrate your dogâit causes cancer.â
That claim is repeated frequently, but the reality is far more complicated.
Castration eliminates the risk of testicular cancer and reduces the risk of some other hormone-dependent diseases. Neutered dogs also tend to live longer on average.
However, research has found possible increases in certain cancers in some breeds, including lymphoma, osteosarcoma, haemangiosarcoma and mast cell tumours.
The important details are often lost:
⢠the effect is not seen consistently across all breeds
⢠the age at castration may significantly alter the risk
⢠delaying surgery may remove the apparent increase in some breeds
⢠studies are often small and do not always agree
⢠a relative increase can sound dramatic while the absolute risk remains low
For other breeds and cancers, the increase may be much more clinically significant.
So the question is not simply whether castration causes cancer. It is whether a particular dogâs breed, age and existing risk profile make one timing option more appropriate than another.
This is another reason castration decisions should be breed-specific rather than based on blanket rules.
find my complete castration guide here - Our Pet's Health Academy - The Dog Castration Safety Bundle