Our beloved Maggie crossed the rainbow bridge a week ago. She was 2 weeks shy of her 10th birthday. I took her to the vet about 3 weeks ago for her annual exam. The vet said she checked out fine, except the need to lose a few pounds. However, her senior blood work raised some red flags. I took her in a few days later for an ultrasound and that is when they discovered her liver was double the size and filled with cancer. The vet was hopeful we could keep her comfortable for about a month. But, it was clear within a day or two that would be unfair to Maggie. Even though she was still eating and giving everyone kisses, she was definitely not feeling well. She had a very hard time getting comfortable and her breathing was becoming more and more labored. We decided to let her go before she suffered anymore. I feel very guilty that I did not have her senior blood work done a year ago. Maybe we would have discovered it earlier and had an opportunity to treat the cancer. My concern now is trying to prevent this from happening to our 3 year old boxer, Frazier. I am worried that the heartworm treatments and flea & tick preventatives somehow contributed to her cancer. My son and I have been doing research and even though both our dogs have been fed a quality dog food, we are supplementing Frazier's diet with fresh fruits, veggies, and coconut oil. Any insight or advice regarding this is welcome.