The Chiweenie is a Chihuahua and Dachshund mix, usually with a miniature Dachshund, first bred on purpose in North America in the late 1990s. It isn't a standardized breed, so looks vary a lot. Many have a long back and short legs with big Chihuahua ears, in coats that may be smooth, long or occasionally wiry. Most weigh between 5 and 12 pounds.
Chiweenies tend to be bold, loyal and talkative, often bonding closely with one or two people and speaking up about visitors and noises. That watchdog streak means steady, patient training matters, along with careful handling of the back and regular dental care. Each dog differs, so look at a dog's age, size and behavior rather than assuming it will act like either parent breed.