Enzymes are an important addition to the diet especially if you suspect your dog is not digesting her food thoroughly, check her stool for color and consistency. If abnormal, contact your holistic veterinarian or vet nutritionist. Also, freezing and refrigeration, even of the fresh food diet, may cost us some enzymes loss. Since enzymes are destroyed by cooking, commercial pet foods are missing these vital substances, yet another reason to switch to the freshly made food.
Dr. Tatang Cahyono, MSTCVM, reports that the routine use of food enzymes is beneficial to dogs suffering from asthma, allergies, diarrhea, constipation, gastritis, colities, obesity, poor weight gain (especially senior dogs), arthritis, liver and bladder problems, excessive shedding, an oily or dry coats, to name but a few ailments.
Before going for commercially prepared enzymes, as a preventive measure for above mentioned issues, you can consider adding from time to time kefir or plain yogurt in moderate amounts, which is probably the most generous source of enzymes both for dogs and humans.