I agree the studies indicate that lawn chemicals definitely can have an affect on this cancer. There also seems to be a strong genetic link as well (obviously every dog who steps on a treated lawn doesn't get TCC)There is a study at Purdue that is working on that connection.
www.cancercompass.com/message-board/message/all,15120,0.htm
I think I just posted the link to the post on the cancer board that first alerted me to it. You can participate by sending a blood sample from your dog to them. They are studying Westies and Scotties closely as these guys have a higher incidence of TCC and have a genetic breed link.
The Purdue people are happy to have samples from other breeds as well-- as comparison samples, I assume. This study will not help our babies but it could be a help for others. And for all those mean people out there who don't think we should be grieving so much for our pets, the findings at Purdue could benefit humans as well.
I'm assuming they are still accepting samples, but you can contact them directly.
Marty