Dexter is 15 lbs. of solid cat. He scratches & tosses litter with great enthusiasm, before he assumes the pose.
When he is done...you would think that he was working to build something...litter flys everywhere.
No "cat box" is large enough to contain his litter storms.
I buy plastic storage boxes & toss the lid. They are a little longer, wider & higer than the largest cat box.
They are not expensive, clean easily & Big Dex can toss litter to his hearts content.
His sister Sadie...is a dainty little girl. She gets in...does her stuff & is out.
I think that it might be a male thing...like a human male leaving a toilet seat up.
Sorry guys...I couldn't resist the reference.