How long can a dog live with cancer?

My dog died from cancer when she was 9 if you have an experiance with a dog dieing from cancer please tell me. My dog lived about 6 months with cancer in her leg but then we put her down beacuse the tumor in her leg got so big it started to bleed. :(

Depends on the type of cancer and how quickly it's diagnosed and treated. 

My Lab Molly showed the first signs of illness in December 2003, but it was that far advanced that there was nothing that the vet could do for her, by the 1st of Feb 2004 she was suffering too much and had no quality of life, she had spent 5 days at the vets and was just getting gradually worse, so l had to make the decision to let her go, she had suffered enough and it was the last think l could do to help her. 

She was only 6 years old, and only lived for a few weeks after being diagnosed, if the cancer had been diagnosed earlier then maybe with treatment she would have had longer, but she didn't show any signs of illness until it was too late. 

Best Answer:  I've got a dog with cancer he's had it for a year or two. It started as a little lump on his back, that got surgically removed. It came back on his shoulder and is humongous. I feel so bad for him he doesnt seem to be bothered by it at all hes acting like his normal self. Im thinking about having him being put down soon, hes starting to limp and hes got that pleading look in his eyes...Oh lord I've started to cry.