When is a dog considered senior?

The moment a dog is considered "old" can vary greatly depending on the breed and size of the dog. However, generally speaking, a dog is considered senior when it has reached half or more of its average life expectancy.

Here is an approximate guideline for some common dog sizes:

• Small dogs (e.g., Chihuahua, Pomeranian): usually considered senior after 10 years.
• Medium/large dogs (e.g., Labrador Retriever, Australian Shepherd, Czechoslovakian Wolfdog): usually considered senior around 9 years.
• Giant dogs (e.g., Saint Bernard, Great Dane, Dogue de Bordeaux): can be considered senior as early as 6/7 years.

It is important to note that a dog's general health, lifestyle, genetics, and the care it receives can influence its life expectancy and how it ages. Some dogs may age more quickly than others, while others may maintain good health and vitality even in old age.

In any case, when a dog becomes old, it is important to pay particular attention to its health and needs, including regular veterinary check-ups, an appropriate diet, and an appropriate level of physical activity.