In the comments, viewers have shared their own stories of ageing pets, many admitting they'd never noticed the change until it happened. Videos like this often hit hardest because they're so personal.

The black-and-white, mixed-breed dog was very smart ... The mini sheepadoodle who looks like a real-life version of Charlie Brown's dog Snoopy.

In 2015, a brown and white puppy with floppy ears wandered onto ... Bodin Allen lost under a full moon in the high desert. That dog, Buford, got famous this week after shepherding Bodin to Dawn ...

"Your scent on these items helps your dog to feel close to you. Socks, pants, and shoes are all fair game!" A stock image of a white and brown dog looking into the camera while leaning against a ...

It was around dusk on Oct. 22, 2014, when a 23-year-old intruder scaled the steel fencing at the White House ... Service dog, Jordan, a Belgian Malinois with a tan coat and a brown snout.