Sheep on the road

There were many sheep on the island and some of the were allowed to wander around to find food. I wonder how each family would know which sheep belong to them?  There must be some sort of markers on them to identify ownership. Our host family was an older couple in their 60's. They do not speak English and  we do not speak Spanish. It was so funny when we tried to communicate with them using the basic dictionary we downloaded. Sometimes the translation was so far off from what we wanted to ask and we all had a good laugh. 

MTV