How big do beagle chihuahua mixes get?

First of all, it depends on how big the mother and father are. If it is a standard dachshund, then most likely it would be something around 11-18 pounds, but larger than a miniature Dachshund and Chihuahua mix. On the other hand, a miniature Dachshund and Chihuahua mix should weigh something around 8-10.9 pounds.