[header] How to know if your dog has cancer [title] Check your dog over regularly for lumps and bumps on the skin's surface or just under the skin. [step] The goal here is early detection of any tumors that could be associated with cancer. Grooming your dog is a great chance to become familiar with what's normal for its body. 
[substeps] Don't panic if you find a lump. The lump could be a wide variety of things, from a harmless spot or mole to a more serious, aggressive cancer.