2 sightings
I think there is a black one on the street in an episode of modern family, where phil and claire are on the neighbor's porch, their son has befriended the elderly neighbor (who is the library cop from Seinfeld), season 1 or 2....
also, on the commercial for camping (AWAY) narrated by tom selleck, there is an element pulling a popup through the woods, and the people go paddle boarding with their 2 dogs...silver one