The Joy of 4 Legs

I am trying to walk Jess every day for a bit of bonus healthiness. We go for a jog three times a week and a long walk the other days.

After our run I'm beat! Red face, unlady-like sweatiness, and more than a little out of breath. Jess however looks as if she could do it all again - twice!

How much fun would it be to have four legs and bounce and run and jump with ease?