A good rule of thumb when feeding your pet: Stick with the basics — high-quality basics, but basics nonetheless. The ideal canine diet should be made by a well-established manufacturer using common protein sources such as chicken or beef and containing grains including wheat, corn, and rice. While dogs don't absolutely need meat in order to survive (unlike cats, which are obligate carnivores), they instinctively scavenge for meat, and the proteins help keep them strong and healthy.

Omega-3 fatty acids, which can be found in fish oil, are key to your health, and the same good-for-you ingredients are also great for your pup. Fish oil has many positive health benefits for a dog's skin and coat, and it supports the overall function of many vital organs. Further, omega-3 fatty acids have been found to slow the growth of tumors and reduce inflammation, which is an important aspect of controlling many types of cancer.

Medicinal mushrooms like reishi, turkey tail, shiitake, and maitake containing lectins, β-glucans, and PSK (polysaccharide K) are considered to be very important ingredients when it comes to preventing cancer. Lectin can help stop the growth of cancer cells and may aid in killing them, β-glucans stimulate the immune cells and have an anti-inflammatory effect, and PSK has been used in human cancer trials. It has been found to increase survival, decrease recurrence, and stimulate the immune system.

Speaking of turmeric, this antioxidant and anti-inflammatory ingredient is also a key in reducing your canine's chances of developing cancer. Oxidative damage to our cells is harmful and may contribute to mutation of the genetic material in cells, but if we can reduce oxidative damage, then we can potentially reduce the risk of the development of cancer. Though you may think that sprinkling turmeric over your dog's food is the way to go, this isn't ideal. The primary reason is that it won't be absorbed well by your pup.