I have had two dogs develop cancer from what I beleive was caused by chemicals a lawn service was treating our yard with,of course I was assured it was a very safe treatment the dogs just needed to stay off the grass till the lawn was dry.I never thought about it again. Not thinking that the dogs can still pick up the chemicals on their paws after a rain. My dogs were exposed for only three months when we moved from Florida to Pennsylvania in fall 2001. Bubba was two years old and on his way to his Champion title, Grace was 6. In May of 2002 Bubba ,just turned three,had exploritory surgery for a mass the Vet discovered in an examination. Advanced Lymphosarcoma,with meds he could live two to four months ,without meds, he had about two weeks. I had seven months more with Bubba and on December, 31st 2002, Bubba had to put to sleep.I promised him I would not allow him to suffer. 10 months later Grace was diagnosed with Lymphoma in September 2002 and needed to be put down October 17,2002. Granted , the chemicals may not have been responsible for Grace's cancer BUT even the Vets agreed it was possible. A few people on other sites have dissagreed with me about using chemical services for their lawns and thats ok ,if you know of a service using all natural products ,good,make them poove it. I use a recipe of 1/2 cup of dish soap, 1 cup ammonia,1/2cup of instant ice tea mix put into a 20 gallon sprayer that hooks up to my hose ,used once or twice a week it is great for the grass(it doesn't kill weeds) and flowers,and helps cut down on fleas and ticks and it is safe enough for my bassets wet or dry. Please just take this as it is ment, a precaution.