As mentioned above, if you did research on any breed, you will find they all have 'something' that is a major health concern.
We had Dobies for a number of years and they have serious heart issues. Their life expectancy is much shorter than Greyhounds.
Ten is considered quite old for a Dobe. We had one die of heart failure at age 7.
When we were reasearching Greyhounds, our vet told us they are the healthiest of the large breed dogs, with the least amount of gentic 'issues'.