Reviewed by Dr. Becker

With so many genetic issues in today's breeds, such as hip dysplasia, hypothyroidism and eye problems, it may seem like an impossible task to find a breed that has relatively 'clean' genes. Yet it's a possibility with these 10 breeds.

Its cause is a mystery. Theories abound, but not a lot of definitive information. One thing's for sure - it comes on like gangbusters and can be fatal without equally swift and aggressive action. Find out the likely breeds, ages and fast-onset symptoms, so you'll be prepared.

This dog breed has shed a stunning three years off its normal lifespan in the past decade. What's going on? Others have too, but not that much. Plus, if you're considering one of these dogs, here's how to pre-determine how healthy your new pet might be.