Small dogs generally live longer than larger dogs, with an average lifespan ranging from about 10 to 18 years depending on the breed. Most small-breed dogs live between 12 and 16 years, though some can live even longer, sometimes into their late teens or early twenties

. Here are some average lifespans for popular small dog breeds:

• Chihuahua: 14–17 years
• Pomeranian: 12–16 years
• Yorkshire Terrier: 11–15 years
• Maltese: 12–15 years
• Shih Tzu: 10–18 years
• Toy Poodle: 10–18 years
• Miniature Schnauzer: 12–15 years
• Jack Russell Terrier: 13–15 years

Small dogs tend to live longer because they experience less wear and tear on their organs and bodies compared to larger breeds. However, as they age, small dogs can be prone to health issues such as heart disease, dental problems, liver and kidney disease, and pancreatitis

. In summary, small dogs typically live between 12 and 16 years on average, with some breeds and individuals living significantly longer, making them among the longest-lived dog breeds overall.