Cancer is one of the more frequent diseases that veterinarians see day in and day out. One of the keys to successful treatment is early recognition - just like it is in humans. Diagnosing and treating cancer can be expensive and pet insurance can certainly come in handy. Most pet insurance policies will cover cancer, but make sure you get a policy that not only covers chronic diseases, but has adequate coverage.
A reader sent me a link to an article on the National Canine Cancer Foundation blog. It gives an excellent overview of cancer in dogs, especially how pet owners can help with early detection at home. I think it will be helpful to you.
I also came across another website that has a series of short videos explaining what cancer is, the steps to detecting and diagnosing cancer in pets, making decisions about treatment, and also explaining the options available for treating a pet's cancer.
I invite readers to comment about your own pet who may have had cancer and if you had pet insurance, how that helped.