They explain that yellow and blue tennis balls, like the one this foster pup is playing with, are favorites for dogs because they see these colors better than others.

Go for gold with these sporty action shots! Here's how to achieve mesmerizing water spinning from tennis balls mid-air ...

"Sampson's love for tennis balls is unmatched, so we've made it a tradition to celebrate his birthday with a piñata filled with 200 of them, blue and yellow, the colors dogs can see best," Miller ...

Correctional staff later confirmed that a blue tennis ball had been found on the center’s property, and they suspected someone had thrown it in. NSP said it was filled with nearly 30 grams of K2 ...

An onscreen text explains the plan: “Surprising my ball-obsessed dog with a piñata full of 200 balls for his birthday.” The piñata is then filled with a mix of yellow and blue tennis balls.

The blue hue—now trademarked as U.S. Open Blue—is just about the exact opposite color of a yellow Wilson tennis ball on the Isaac Newton color wheel, providing the most contrast for players ...