Early Results Of Dog Longevity Treatment Show Promise

The program looked for Cavalier King Charles Spaniels with an advanced case of a degenerative heart condition called mitral valve disease.

Joyce Crommett breeds a type of dog that, typically, lives fewer than ten years: Cavalier King Charles Spaniels. 

One of them, Billy, has become one of the first dozen pets to be injected with a gene therapy treatment intended to extend dog longevity.

"I was thrilled to get him into the program," Crommett said.