Original sentence: Inbreeding among purebreds has exposed various genetic health problems not always readily apparent in less uniform populations.Several studies have shown that mixed-breed dogs have a health advantage over pure-bred dogs
Edited sentence: (State of Pet Health 2013 Report, Banfield Pet Hospital).A recent analysis of veterinary records revealed that dogs under 20 pounds had an average lifespan of 11 years while those over 90 pounds typically lived for only 8 years.Breeders can use the database to analyze pedigrees and create matches between dogs that show more health strengths than weaknesses.For mixed breed dogs, owners can use an individual’s weight to help determine how long he or she would be expected to live.Health screenings are growing in importance as the positive benefits are understood by breeders.Health screenings help make finding the perfect breeding match possible.Health testing can help everyone from breeders to buyers to researchers.In general, small dogs enjoy longer lives than do their larger counterparts.Inbreeding which occurs more often in mixed breeds than among purebreds has exposed various genetic health problems not always readily apparent in less uniform populations.Increasingly, reputable breeders of purebreds are turning to health testing to ensure they are doing all they can to create strong matches between dogs that result in healthier puppies.Medium and large dogs fell in the middle at around 11 years.Parent clubs count on the hard work of their breeders to ensure all litters are full of healthy puppies.Puppy buyers can know they are looking at puppies that have a reduced chance of inheriting breed-specific health problems when the parents show favorable health screening results.Several studies have shown that mixed-breed dogs have a health advantage over pure-bred dogs mainly due to lack of mongrels receiving veterinary treatment on a consistent basis.The preceding is a chart of purebred dog life expectancy by breed found on petmd.The provided link gives a true comparison of dog longevity based on weight of the dogs.com for several popular purebred dog breeds