chihuahua on xantax? is this advertisement cool? we didn’t think so?!?!? nadia July 8, 2011 chihuahua news 5 Comments famous chihuahua wasn’t sure of what to make of this veterinarian advertisement for xantax. either way, we are not happy about their approach to marketing and would like your feedback! Follow Famous Chihuahua on Istagram share this on social media!