Can a dog's saliva really reveal its age?

Suppose someone said they could tell the age of your dog from its slobber. Would you believe it or dismiss it as hocus-pocus?

Several vendors of at-home genetic test kits make exactly that promise. Curious whether it's true, and if so, how the technique works, the VIN News Service put one of the tests to the test.

This story was published on March 10, 2025.