I've never noticed that with Kali and Orion, but I CAN tell you to stay away from pig ears and hog feet...OMG! That stinks!!
Chew hooves are good though...Kali will only chew the black ones though
she's picky. Just watch for when he chews them down small enough to swallow...and take them away...we actually had to stop buying chew hooves because Kali and Orion's jaws are just so strong they have them broken up in a matter of minute...next thing we know they are puking up the hunks of hoof