Justus and I enjoy walking, we put in 3-5 miles daily. Up until last week. We are both wanting to get out for a good stretch, and will, but baby puppy Flyer won't be asked to do that. I'm looking at borrowing a pet stroller to take him with us. There is a wonderful meadow, will make nice background for photos... How much walking can I allow a 10 week old puppy? I'm thinking 10-15 minutes max.... is that okay?