What Does A Pug/chihuahua Look Like?

Mixed breeds can take any traits or combination of traits from the breeds involved with even litter mates ending up completely differently from each other. They don't have set genetics that lead to predictability like a pure bred. You would study up on both breeds to learn the possibilities and you can try looking around on petfinder for some same or similar mixes to get some ideas.
www.petfinder.com  
www.pugs.org www.chihuahuaclubofamerica.com
home.comcast.net  
www.learntobreed.com
www.wildheirlabradorrescue.org