When is my Pet a Senior?
While every animal is different, there are general guidelines to determine when they become "senior citizens." Cats are considered mature at 7 to 10 years, senior at 11 to 14 years, and geriatric at 15 or older.
Dogs, in general, may be called senior at seven years of age, but larger dogs age more quickly. A Great Dane is a senior at 6 or 7, for example, but 7 is only middle age for a Chihuahua. Ultimately your pet’s genetics, nutrition and environment will all play a role in determining when he is a senior.