Metamucil and Benadryl for Anal Gland Problems

Both are reasonable ideas to try under your vet's guidance. Fiber such as psyllium can bulk up the stool so the glands empty naturally; it's low risk, though studies haven't proven it prevents anal gland problems. Antihistamines are sometimes tried because allergies often contribute, but they don't help most allergic dogs much. Stick to your vet's dose and make sure any antihistamine has no added decongestant or xylitol (found in some liquid forms), and use plain, unflavored fiber.

If the glands are painful at every checkup, ask your vet whether they're infected and whether flushing and medicating the sacs, or allergy testing and treatment, would help. Table scraps are unlikely to be the main cause, but keeping treats small helps stool quality.

See anal gland treatment.

This is general information, not a diagnosis. Please follow your own vet's advice.