Whoever said "you can never have too much of a good thing" was probably standing at the top of a ladder holding a massive bucket of tennis balls. I would imagine their declaration was followed by excitedly asking, "BALL?! You want the ball?!" Your dog eats bugs, licks single ladies who approach him at the park, and still gets blamed for all your farts — the least you could do is give him a moment of ecstasy with a bulk purchase of his favorite toy. Besides, he'll probably forget about it the next day so you can surprise him again. Think of it more as an investment.