What was more important and resulted in human evolution at our current stage, the domestication of the dog or the horse.

Opinion question I heard and that has generated interesting discussions with the people I've asked. If available I would be interested in reading a more scientific study on the subject.

Dogs are critically significant for safety, hunting, companionship.

Horses have been major roles in agriculture, transportation, warfare.

Plus there's lots of overlap in their functions in certain ways, hearding / sheep dogs compared to horses allowing for better managing heards.

What do you think? What are some unconventional benefits or drawbacks of each that someone may not think of?