Mammary gland tumors in dogs and cats are similar to those in humans, and are usually discovered by owners during petting. Just like in humans, lumps discovered in the breast tissue of dogs and cats can be benign masses or malignant cancers.
Mammary gland tumors are most often found in intact (not spayed) females, or females that were spayed later in life. In dogs and cats, spaying at a young age has proven to greatly reduce the incidence of breast tumors that occur later in life.
Whenever your pet is showing signs of a health issue, your first step is to contact your primary care veterinarian. If it is indicated that your pet may suffer from a mammary gland tumor or another serious condition, a veterinary specialist is available at an ExpertVet certified hospital.