When do I need to switch my dog over to senior dog food?

A dog is regarded as being old once he reaches 7 years of age. Is your dog exhibiting age-related problems? Does he have stiff muscles and joints and is he getting tired more easily? Then it would be a good idea to switch to senior dog food. It could, of course, be that your 7-year-old dog is still really active and full of energy. In that case, there’s no harm waiting for a while before making the switch.