Dogs should switch to senior dog food when they begin entering their senior years, but the exact age depends on their size and breed. Small dogs usually become seniors around 10–12 years old, medium dogs around 8–10 years, and large breeds as early as 6–7 years because they age faster. Senior dog food is specially made for older dogs with lower calorie needs and may include nutrients that support joints, digestion, heart health, and brain function. Signs that it may be time to switch include weight gain, lower energy, joint stiffness, slower movement, or digestive sensitivity. However, not every older dog immediately needs senior food, especially if it is still active and healthy. The transition should be done gradually over 7–10 days to avoid stomach problems, and a veterinarian can help choose the best diet based on the dog’s health and lifestyle. Learn more about dog age and care visit: https://dogagehub.com