Loyal, a first-of-its-kind anti-aging drug in the works to extend the life of dogs, has reached a key milestone: senior dogs across the U.S. are taking the pill as part of a clinical trial. Boo, an 11 ...

Add Yahoo as a preferred source to see more of our stories on Google. A once-daily, meat-flavored longevity tablet is being trialed in old dogs. The drug aims to extend dogs' lifespans, keeping old ...