A few nice service animal images I found:
Ethiopian cargo service
Image by Evgeni Zotov
On the way from Babile to Harar our minibus stoped to take aboard sheeps that somebody wanted to transport to Harar. They tied up sheeps' legs and loaded them onto roof one by one. There was just metal grid on the roof and all the way to Harar was bumpy. I asked those people if they care about condition of animals - 'coz they certainly broke some bones. It's ok, they told me, those animals are just for meat.
Later I saw such style of transportation again and again.