NEVER!!!! My friend's Westie had to have a $2000 surgery after a Greenie got stuck in his intestine!!!!
I don't feed most mainstream items you can find everywhere. They are just too dangerous and have crappy ingredients in them. Almost all the treats and chews at PetSmart/Petco are full of by-products, corn, wheat, & soy. Please don't think I am being stuck up or rude, I am just overly cautious and am obsessed with Snick's diet and treats. I am too paranoid.
Holiday Hugs-
Snick & Viv