I worry, somewhat, about exercising Willow too much. She is so enthusiastic that I think she'd play if she had to drag herself to a toy. I want her to grow up strong and healthy but don't want to do so much that it is detrimental. Are there any guidelines, is walking her ninety minutes a day too much? I usually let fetching go on for fifteen minutes and lure chasing five to ten minutes at a go. I carry her up and down the stairs as I don't want to stress her shoulders while she's still developing. Am I worried over nothing?