You’ve probably taken supplements and know what they can do for a healthy life. But what about your pet? While several schools of thought abound, common sense may be the best adviser when it comes to this important question. As in people, some advice says— all you need is in the foods you eat. Those are easy words to hear when everything is going great. But start with some stiff knees, bathroom issues, or anxiety beyond your comfort level, and soon you are looking for natural answers.