Chihuahuas are affected by three problems, mainly, an elongated soft palate, luxation of the patella, and hypoglycemia. Unfortunately, most of these problems are hereditary and shouldn’t be bred from. Luxation of the patella refers to the dislocation of the kneecap. The problem is noticeable as the dog ages. If this happens, you need to seek immediate veterinary treatment. Small dogs with elongated palates have difficulty breathing, instead, they snort, wheeze, and sneeze. In hot weather, you’ll realize that these dogs are susceptible to heat stroke. Blood sugars dropping drastically can be fatal in Chihuahuas.