Hi I have an 11 year old show cocker spaniel and have recently lost a 10 year old to a tumour, I have always walked my dogs from an early age for long distances and at their age Now have never had any issues with arthritis or joints, I have a 5 month old cocker puppy and have started her on long walks(2hours every weekend and 45 min walks in the week) from about 4 months old as I did with my other dogs. I have just read however about this 5 min rule for each month of the puppies age which means I should only be walking her 25 mins a day!! I am worried I may have caused damage to her already by these long walks in the last month? I have never heard of this even though I have had dogs for 11 years. The problem is she has bundles of energy and stamina and I know 25 mins a day will not be enough for her as even after 2 hour walks she is still running round with my other dog??? I would just like to know how much damage I could have caused in this last few weeks?? And if I should be doing the 5 min rule or if she can handle the walks keep going??