A sassy breed with a delicate build and large, round eyes, the Chihuahua can live up to 18 years. Similarly to humans, much of the aging process is impacted by how much strain is put on a dog’s body, Werber said, and smaller breeds like the Chihuahua may not have as much physical strain as a larger breed. Assuming that they don’t experience any major disease or accidents and are able to live a normal, happy life, small breeds comfortably live to at least 14 years old, Werber said. Chihuahuas require little exercise beyond a short daily walk and are extremely devoted to their people. Health conditions commonly seen in the breed can include patellar luxation and some heart problems.,In comparison with a human’s lifespan, our four-legged friends don’t get nearly as much time as we’d like them to. There are, however, some breeds that tend to live longer than others. According to Emmy-award winning veterinarian Dr. Jeff Werber, when it comes to determining how long a certain breed may live, the smaller the dog the more likely it is to live longer, with may small breeds living well beyond 14 years. Learn more about long-living dog breeds, the health conditions that may affect them and how to keep your dog healthy through his senior years, here.)