Here's why it's difficult to predict:
* Many terrier breeds exist: There are numerous types of terriers, each with its own size range. Some are small like the Yorkshire Terrier, while others are much larger like the Airedale Terrier.
* Chihuahuas have a wide size range: Even within the Chihuahua breed, there's a difference between the "apple head" and "deer head" varieties, and some are naturally smaller than others.
General Considerations:
* Larger terrier + Chihuahua: If a larger terrier breed is involved, the mix is likely to be bigger than a purebred Chihuahua.
* Smaller terrier + Chihuahua: If a smaller terrier breed is involved, the mix could be closer to the size of a Chihuahua.
The best way to get an idea of the potential size is to:
* Ask the breeder: If you're getting a Chihuahua Terrier mix from a breeder, they should be able to provide some guidance based on the parents' size and lineage.
* Consult a veterinarian: Your vet can help you estimate the adult size of your dog based on their growth and breed mix.
Important Note: Even with the best estimates, it's important to remember that all dogs are individuals. A Chihuahua Terrier mix may end up being larger or smaller than expected, depending on their specific genetics.