We love our dogs, and they can practically do no wrong — that is, until they have an "accident" inside. The sight of dog poop on the carpet can certainly make your stomach sink and your nose crinkly.

Turns out, it’s easy—if you jump on it right away. “The earlier you remove any contaminants or soils, the easier it is to get good results,” says carpet-cleaning specialist Jeff Cross of ISSA, the ...