The lifespan of a guard dog varies depending on a variety of factors including breed, genetics, diet, exercise and living environment. Generally speaking, the lifespan of many large dog breeds is about 9 to 12 years, but the specific lifespan is also affected by individual differences.

When raising guard dogs, you need to pay attention to the following points:

1. Reasonable diet: Provide guard dogs with a balanced diet. They need high-protein, low-fat food to keep them healthy. Maintain muscle mass and energy levels.

2. Moderate exercise: Guard dogs usually have high athletic ability and energy, and owners need to take them out for walks, runs or participate in other activities regularly to ensure their health and energy.

3. Regular physical examinations: Regular veterinary examinations can help detect and solve health problems early. Also, get regular vaccinations and deworming to avoid diseases and parasitic infections.

4. Proper training: Guard dogs need professional training and socialization. Proper training can help them establish stable social cognition and better adapt to various environments and people.

5. Pay attention to the source of the dog: When choosing a guard dog, you should choose healthy, high-quality, pure-blooded puppies, and avoid choosing dogs that may have health or behavioral problems.