
Oh I totally agree that 2 hours for a 4 monther would be way over the top :) I just feel the sensible course is somewhere in between these two extremes and it will vary by breed, certainly I don't think anything under the medium size needs to stick to a
5 minute rule. I let my puppies choose the pace, except in training class and gradually increase day by day depending on what they find tiring and this is the advise I give my purchasers. I only sell to sensible people anyway :D I must admit if I had a large breed I would be in a quandary, playing it safe is all very well but could it be limiting their joint development, could it be limited the development of heart and lung I really think it is an area where someone like the AHT should be doing a lot of work on. I find it interesting that Burns have chosen to stick their neck out on this, can't really imagine any ulterior motive which makes me wonder if something has emerged from their monitoring (not testing of course :)) of dogs and puppys reared on their foods.