Companion Animal Welfare

Dog Mammary Tumour Welfare and Prevention

Mammary tumours are common in unspayed female dogs and neutering before first season dramatically reduces risk.

Key Facts

Mammary tumours are the most common tumour type in intact female dogs
Risk is 0.5% if spayed before first season, rising to 8% after one season and 26% after two
Around 50% of canine mammary tumours are malignant requiring surgery and oncological management
Surgical removal is the primary treatment with varying outcomes based on tumour type
Early detection through regular chest examination by owners can improve outcomes

Welfare Considerations

Mammary tumours cause significant morbidity and mortality in unspayed female dogs. The welfare case for early neutering in dogs not intended for breeding is supported by dramatically reduced tumour risk alongside prevention of other reproductive diseases.

What You Can Do

Discuss neutering timing with your vet for female dogs not intended for breeding
Examine your female dog's mammary glands monthly and report any changes promptly
Seek early veterinary assessment for any mammary mass regardless of size