Hi Connie! I may be wrong here but this is what I found worked best for us. Abbey would go through the teenie ones in a day's time and was biting off big chunks so I bought the regular ones for dogs 25 -50 lbs. One of these greenies last her a whole week and she's not getting large chunks from it. She's teething right now so she is always chewing on a greenie.
I've bought other chewing things like the greenies and I'll tell you to save your money! Buy the greenies! The other kinds stink!! :new_Eyecrazy: