Natural health for pets is a subject that I am very interested in. From what I have read so far, I can tell you that once you understand what is good and what is harmful for your pet's health, it becomes a lot easier to prevent health problems in pets.
Like human health, natural pet health is all about four important factors - food, water, exercise, and health supplements. Let me explain.
Food
Not all dog, cat or other pet foods have the proper certification. The certifying body, AAFCO actually has two levels of certification. Make sure that foods are labeled "tested and found to be adequate" vs. a lower standard that states "formulated to meet AAFCO standards. If a dog is healthy, then foods that meet this criteria are fine, regardless of cost.
If a dog, cat or other pet is allergic or hypersensitive, then attention should be paid to fillers, artificial flavors and whether or not a food is organic. Be careful if you decide to provide a homemade diet as it needs to be properly balanced with the 40 components necessary. Remember, dogs only eat one food each day vs. humans which graze through many types of food. The food selected needs to provide all of the required nutrition.
Water
Dogs need constant access to clean uncontaminated water. if you believe your tap water is less than ideal, provide your dog with the same filtered water you drink. Water consumption and the resulting urination help to keep the bladder and urinary system free of bacteria and stone causing crystals. More water means more urination. Also, taking your dog on an additional walk each day will also cause additional urination.
Exercise
Studies show that pets that are active are less likely to develop health problems than pets that are inactive. Lack of physical exercise can weaken your pet's limbs and affect its metabolism considerably. In the long run, it could lead to a number of physical and mental health problems.
Physical exercise plays a very important role in natural pet health. Play with your pet every day, take it out for a walk, get some toys, or get another pet as a companion.
Health supplements
Due to lifestyle factors, domesticated animals may not be nearly as strong as their counterparts in the wild. Also, pets that are domesticated do not have the opportunity to seek essential minerals and antioxidants they need from the food that they eat. A good health supplement that supports the immune system may be of value. This would provide a potential safety net in the same way a human takes a vitamin for extra support. While it may not be necessary, in most cases it can't hurt.