If a “dog year” is equivalent to seven human years, then time passes seven times more quickly for dogs than for humans. So in 1990 Rodney Metts invented a novelty watch that reflects this by advancing at seven times normal speed. This is a reminder as much to you as to your pet:

If a dog is kept locked in the basement of a house during an eight or nine hour day, for example, while its owner is away, the elapsed time on the dog watch will be 56 to 63 hours, or approximately two and one-half days. A one-hour ride in an automobile will register seven hours on a dog watch. Thus the value in dog time of a human activity will become quickly apparent.

That’s the actual patent figure. Part 10 is “dog.”