Answer:
You use a knife to slice my head. And weep beside me when I am dead.
Hard to catch, easy to hold. Can't be seen, unless it's cold.
Stealthy as a shadow in the dead of night, cunning but affectionate if given a bite. Never owned but often loved. At my sport considered cruel, but that's because you never know me at all.
I can be moved. I can be rolled. But nothing will I hold. I'm red and I'm blue, and I can be other colors too. Having no head, though similar in shape. I have no eyes - yet move all over the place.
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.
Why did the stadium get so hot after the game?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?