ok. obviously you all do not understand what I am saying. the dogs eliminate prior to their walk; after their walk (after eating) and my question was why do they have to go WHILE walking as well? and, no, I am not trying to ever stop them from having normal movements.
My bad for thinking you people may have had some knowledge and experience in this matter; from these responses I now know better.
My bad for thinking you people may have had some knowledge and experience in this matter; from these responses I now know better.
When a dog or any other mammal gets excited-for whatever reason, it could be happy excited, scared excited or whatever, that animal has a parasympathetic neural response. This response releases the neurotransmitter epinephrine. One of the effects of "epi" is to induce a bowel movement. The gastric intestinal system is "encouraged" by "epi" to process food boli quickly and eliminate the waste as well.
Since canis familiaris has a relatively straight intestine, the contents are processed very rapidly and there is very little room for storage of waste. Therefore exacerbating the need to eliminate.
So in the biological response to "why" the answer is very simple: The combination of exercise, food, and external stimuli hasten the processing of the food bolus as well as the need to defecate.
From a historical perspective, considering that Canis Lupis has a similar biology, when wolves gather together and play it is usually a prelude to a hunt. On a hunt, extra weight (detritus) serves no purpose but to slow the hunter, therefore it is eliminated.
The behavior you are describing is completely natural and is based in biology. Many hunting breeds will defecate several times on a single outing-to eliminate "dead" or useless weight. The first stools are usually well formed while the subsequent ones may be loose or even runny. Again, it is completely natural and the only way to prevent this is to stop feeding your dogs.