Generally, dogs are considered senior at 7 years old. This varies between breeds. Very large or giant breeds are considered senior around 6 years, whereas small breeds are not really considered senior until around 10 years.
This stage of a dog’s life is equivalent to a person entering late middle age around 55 years old. At this stage the dog should still be fairly lively, but veterinary check-ups should become more frequent.
WHAT TO EXPECT WHEN YOUR DOG BECOMES A SENIOR
Your dog will begin to slow down a bit. When you are playing fetch, he may want to give up sooner than he did in the past. He will probably start to get a bit slower getting up and may not be quite so enthusiastic about food or toys.
These things all comes with age, however, other things you can look out for may indicate some kind of health issue
if your dog becomes confused or disoriented or has more potty accidents than previously, this could be signs that visit to the vet is needed.