Hey Greg, The note in Spanish translates as follows;
Hey Gringo Greg with the short pants, I have a dog that does amazing things with my sister. If you trade me some chips from any casino I'll be happy to teach your dog to do the same thing with that guy from Virgina that has all of those silly middle names. It's great fun to watch. I don't speak English so the commands to the dog must be uttered in Spanish. If you have any interest please get back to me at my address on Avenida de Pero, Tijuana, Baja California.
Salutations & thanks for being so understanding of my stange perversions.
Chao
That's a real rough translation but it's the best that I can do. Hope it helps.