Dogs are actually, funnily enough, an original part of our culture. They seem to have been lost and forgotten rapidly after the 1800s or early 1900s due to the mentality in the magaalo spreading throughout the country in time:
But during the 1800s it seems most nomadic Somali and even some reer Tuulo had dogs so much so that you could tell they were nearby through the sound of barking:
Source:
First Footsteps in East Africa by Richard Burton. He travelled across much of the north all the way to Harar and many times was a guest to different local leaders, meeting everything from various different Daroods, Isaaqs, Dirs and even Hawiyes so it's interesting how he describes the presence of dogs like this as a normal part of Somali culture and not isolated to one tribe.
There is also the fact that dogs were part of the original Cushitic cultural package when our ancestors began migrating from Sudan as early as 3000 BCE. They brought cattle, goats, sheep, donkeys and dogs with them and display as much in several of their cave paintings:
www.sadamire.com
Arabians were similarly laden with dogs historically. They even have a specific and currently well-known breed the Bedouin used to be quite affectionate toward to the point of letting them into their tents:
But with them as well the Reer Magaal (Xadhar) mentality toward them, that I think grew more extreme since movements like that of Muhammad ibn Abd al-Wahhab, spread and became more uniform. Nowhere is it stated they are xaraan, saaxiib. It's just their saliva and getting it on you requiring you redo your ablution before praying. The only mention of dogs in the Qur'an itself, from what I remember, is like one story that was actually positive.
They are good, loyal and useful beasts especially for one on a farm/ranch. Somalis need to let this absurd fear and hatred of them go, I reckon.