The man who made the accounts travelled all over Woqooyi and a good chunk of Galbeed (I believe some of Koonfur too on different expeditions) and met and stayed with people from all four major clans of Hawiye, Isaaq, Darood and Dir and noted how ubiquitous dogs were. They were so common that you could tell a Somali nomad camp or reer tuulo village was nearby through the barking of dogs.
And it's fairly obvious why they stopped:
The settled Somal have a holy horror of dogs, and, Wahhabi-like, treat man’s faithful slave most cruelly. The wild people are more humane; they pay two ewes for a good colley, and demand a two-year old sheep as “diyat” or blood-money for the animal, if killed.
What seems to have happened is that the attitude of reer magaals from back then slowly became mainstream as Somalis urbanized more and more and, more importantly, became more hyper religious. Got to a point where even the nomads developed the same attitude toward dogs when they clearly liked them about a Century ago.