Chihuahuas are known for being very smart dogs, easily trainable. And we found that to be true with our little Chihuahua "Boo". I think that is surprising considering the size of their brain compared to the size of a large dog's brain. Poms are also intelligent little dogs with a good nature. Of course, a lot does have to do with how much you interact with your dog. We talk to Chachi constantly and he understands much of what we say.
My vet says that the combination of Chihuahua and Pom is a perfect blend of temperments. He was thrilled when we first brought Chachi in to see him. He knew how devastated we were when we lost Bear and told us that the best way to fill an empty place in your heart is to bring a new little puppy into your life. He was right.