i give my baby this...
http://www.petco.com/Shop/Product.aspx?sku=901776 i monitor him when i give him this and once i see he has chewed on them too much then i take it away...
it leaves his breath smelling yummy but you do see it in his poop. yuck ..
i gave him a greenie b4 and he threw up so i dont give it to him anymore... but i havent had a problem with the velvet bone yet.