do you know how old a dog have to be to be seniors
The old classic one human year equals seven dog years is an easy way to calculate and relate to your dog's age, but isn't the most accurate. Large breed dogs (i.e. Great Danes) are considered a senior at 6 or 7 years of age, whereas small breeds (i.e. toy poodle) aren't considered a senior until their teen years.
I have always told my puppy people to expect 10-12 years from a Golden. I believe a study has been done showing that to have been the same for a long time now. The larger the dog, the shorter the life expectancy. Toy dogs can be in excess of 15 years, while Great Danes and Irish Wolfhounds can be in the 6-8 age range.