There are a lot of dog food supplements to choose from and that’s because dogs of different breeds with different ages and levels of activity will not only prefer various types of food, but they will also need different types of food supplements. This is no surprise if you have any idea about the large variety of dog species. You can’t just choose your dog’s nutrients randomly. For example, a large big dog will need glucosamine sulfate for stronger bones and joints while an old dog with digestive problems can better benefit from some extra enzymes.