Generally, the height ranges between 6 and 9 in (15 and 23 cm); however, some dogs grow as tall as 30 to 38 cm (12 to 15 in). This does not mean that they are not purebred Chihuahuas; they just do not meet the requirements to enter a conformation show. Oversized Chihuahuas are seen in some of the best, and worst, bloodlines. Chihuahuas do not breed true for size, and puppies from the same litter can mature in drastically different sizes from one another. No color or pattern is considered more valuable than another. The lifespan for a Chihuahua is usually between 12 and 20 years.Chihuahuas are also known for luxating patella, a genetic condition that can occur in all dogs. In some dogs, the ridges forming the patellar groove are not shaped correctly and a shallow groove is created, causing the patella to luxate or slip out of place, sideways. The knee cap sliding across the bony ridges of the femur can cause some pain.
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