[header] How to treat mammary disease in intact female dogs [title] Check the mammary glands in your female dog. [step] Mammary gland tumors can occur in any of the mammary glands in your dog. It can also occur at any time, before or after they have given birth or while they are lactating. 
Check your female dog often for any irregularities. [substeps] Most often, mammary tumors occur in the back glands, nearest the hind legs.