The cold and snow can make exercising with your dog difficult, but it's far from impossible. To keep her in shape, try these creative solutions. Just don't forget to refill the water bowl. Dogs need to drink before, during and after any activity, even in winter. Photo by Getty Images. 1. Play indoor fetch. Make it more challenging by throwing a tennis ball up the stairs-your dog's legs will get a good workout. Plus, she'll love the extra playtime and attention. Related: Check out the 10 best fitness DVDs. 2. Build an obstacle course. ...