I say "dazzle,what's your favourite colour?"...dazzle barks once. then is say "Red?"...she barks again. Then there is a row of 10 different coloured blocks in a row.I say "dazzle,go get your favourite colour" she goes and gets the red block. Only the red block has my scent on it...all the others have been washed,blowdried and put out will tounges...and the dog goes for the red block every time. it has nothing do do with the actual colour people who don't know much about dogs think they actually know what colour it is It takes a couple weeks to perfect...but is a real croud pleaser!