
I have to say I find the 5 minutes per month of age very little, is it per day or per walk?
20 minutes sounds very little out time for a 4 month old if you divide that to few little walks. You do not get very far in 5 minutes with a puppy that is sniffing around and wants to say hello to every person they meet and wonder the wonders of world :)
I am not arguing the general view but just wanted to tell what I have been told...
I have always been told that puppy should get some exercise as muscles will support the developing bones! The breeder of my older dog (giant breed) always let the puppies left with her follow the bigger dogs on walks (all off lead) from pretty young age.
She pointed out the importance of exercise and not let puppy get unfit by not walking and being overly scared of letting the pup exercise.
We were told to avoid letting the pup jump up and especially down from places as the jump down can harm the elbows as they take the weight of the dog.
Our puppy was carried up and down stairs for first 6 months (30kg!) also and was also limited to go up and down on her own after that (gates).
She was lifted off the car untill about age of 9 months and after this she was supported when jumping down.
This person has been breeding for about twenty years and has some of the best hip/elbow results in the breed! I do not think they have 1 dog they own themselves and that has followed the regime and exercised from pretty young age that has had bad hips or elbows!
I do not mean taking the pup for miles of lead walking.
I believe the best way is to find a dog of a similar size and just let them run together.
But it will definitely add up to more exercise than 15 minutes of lead walking if the puppy is running about off the lead. This will obviously also develop their balance, body co-ordination and social skills.
Also the puppies used to go out on walks in the forest in the winter so would walk/jump/crawl in a deep snow...
I suppose this in a way could relate to swimming as the body is supported by the snow around it?
Something we did from when our dog was about 6 months and had had her hips checked and healthy (un-official x-rays, official ones not taken untill 2 years) was to go and run her from one person to another in deep snow!
This was also following the breeders advise to get her good muscle to support her bones and especially back (Breed with longish back).
Also we were going on bike runs on soft ground from when she was around a year old.
My dog is now 10 years old and has good hips and has never had trouble with her hips... which considering her breed is not the norm at 10 years of age.
My current puppy is 3 months old and goes out to play with a cocker at least once a day,off lead running for about 30 minutes. Obviously they do not constantly run for all this time! On top of this she gets slow poo&pee walks which on their own must add to about 30 minutes (or more) again spread over the day. plus the time she spends in the garden and runs about in the house...
So I'm one of those people who is not so sure about limiting the puppy too much...
I believe everybody has their own believes and what they have found/learned to be the best way.