Of all the dogs I hate this one the least

I could get used to this new kind of dog. He is old and decrepit! And he can barely walk anywhere without wheezing and running out of breath! He is like the Darth Vader of dogs, only minus the horrible telekinesis and noisy energy-based weapons! The best part is that he does not seem to be interested in chasing me. His body is riddled with old age and he cannot torment me like the other three dogs! Haha!

So this bodes well for me. All I need to do is find a way to age the other three dogs to the point that they no longer are able to chase me anymore. As I understand it dogs age 7 years for every 1 human year. So in the next year or two they will all be too old and decrepit to chase me. And then victory will be mine!