Mammary tumors in cats

Some important figures: 

17% of female cat tumors, 76% of female cat genital tumors.
Mostly affects older cats (10-12 years old) except Siamese (+ young)
Mainly hormone-independent carcinomas (80 to 90%) of a simple type (involvement of a single neoplastic component: epithelial light)
85% of tumours are malignant and have already metastasized on the day of diagnosis: 50% to 90%.
most commonly regional lymph nodes (83%), lungs (83%), liver (25%) and pleura (22%)

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Mammary tumors in dogs

Epidemiology

Both daily practice and statistical data show that breast tumours are the most common cancers in dogs.
Different studies estimate the prevalence of this pathology between 25 and 50% depending on the studies.
One in two bitches is at risk of developing a breast tumour one day, which is three times higher than the incidence in women.
The average age of onset of lesions is 6 to 10 years. 10-year-old females are reported to be the most affected (16%). Females between 9 and 12 years old are said to represent more than 45% of sick animals.

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