Sheepish Camels Can Bark!
On their way home they got in a fight and decided to split up. When they divided the sheep there was one sheep left. So Ali said to Ahmed, "I take the last sheep and you can get the goat".
"That's not fair," said Ahmed, "a goat costs less than a sheep".
"OK," Ali said, "then I will give you one of my dogs and then we are even".
Ahmed agreed that the trade was fair. (since 1 sheep - 1 dog = 1 goat + 1 dog)
What's the cost (in dinars) of a dog?