Dog vitamins and supplements can be a useful way to fill nutritional gaps, support specific health needs, and improve overall well‑being when used appropriately. Common options include multivitamins for general support, omega‑3 fatty acids for skin, coat and joint health, glucosamine/chondroitin for mobility, probiotics for digestion and immune balance, and targeted minerals or antioxidants for age‑related or breed‑specific concerns. They are most helpful for puppies on homemade diets, senior dogs, animals recovering from illness, or pets with diagnosed deficiencies, but they are not a substitute for a balanced, complete diet.