If you’re owner has been awful to you and you’re missing your recently departed gonads, I know you’ll feel better with hard (or squishy) ball-shaped materials shoved into your sac.
And, humans can undergo surgery so they can have a real set of “testical implants.” (Read: real fake balls!)
Seriously, what the hell is going on with this world?!
However, unmasculine you think your dog, cat, horse or bull may feel, I’m willing to bet he’d feel a hell of a lot more violated and uncomfortable with fake fucking balls.