The come-ons are written in Spanish and taped to a wooden counter by the cash register: ” I’m handsome, neat, and my name is Chester. I’m looking for a hot little bitch who’s crazy for me!” “I’m playful and loving, with a good character. Searching for a beautiful girlfriend to make a family. (Please call my owner’s cell phone number.)” Many include color photos of the machos, like this one for “Diego”: “Hi, my name is Diego and I’m a 4-year-old bombón Lab. I’m searching for a girlfriend. It’s already time to think about the future.”   El Fotógrafo and I check out the signs each week when we…