$20 for a Presa Canario? That seems kind of odd, maybe it was a mix? or stolen. The breed was at one point nearly extinct. A few dedicated breeders were able to bring it back and they're not common dogs. The last I read/watched anything about the breed there were only a few breeders in the US and most were very careful with their pups.
That dog reminds me of Christmas day a few years ago. DH and I had stopped at my dad's house to exchange gifts and such. Upon getting out of the car we noticed a boy walking up the street -who was very frightened of the huge dog following him. It was a huge brindle mastiff that only wanted attention.
DH got the dog's attention, allowing the boy to hurry passed. DH also got a big slobbery dog kiss when the dog jumped up on him.
-Turns out the dog belonged to a new neighbor that lived a couple blocks away. He came and got his dog (who had snuck out).
There was also someone in that town that had Irish Wolfhounds. I'm sure everyone here knows they're big dogs, but until you see one up close you may not realize they're close in size to a pony.