Dietary advice
At the 'post-maturity stage', which usually begins when smaller dogs are about eight years old and at five years for the large and giant breeds, they may have different dietary requirements. In this 'post-maturity' phase, the tissues, organs and systems of the pet are gradually becoming less efficient. This is quite a natural progression, but it can be well managed, hopefully making sure that the pet has a good level of activity and wellbeing for the remainder of its life.
The rate of progression is dependant on many factors, such as the environment the pet lives in and its genetic make-up. However, by far the most important component is the pet's nutrition, both in the past and how it is now. A pet that is the optimal weight and has had a good diet throughout its life will enter this phase with few problems.
As soon as you notice any 'ageing' signs, such as greying around the muzzle or a bit of stiffness after rest and a gradual slowing down, you should start considering your pet's diet, and how you can make it more suitable to its needs. You need to take account of the changes that are happening in your pet's body. For example, the amount of skeletal muscle in the older pet will decrease with age. This loss of skeletal muscle means that not only is there less physical activity, but the pet's ability to repair damaged tissues and produce energy from food is reduced.
Older dogs have varied dietary needs; ask your vet for advice about the one suited for your dog.