We have been giving Toto greenies ever since we first discovered that she loved them! The only problem we have ever had ... Patrick picked up the wrong size once [got the medium] and because of our ignorance we let her have one. It gave her an upset stomach ... we inspected the part of it that she hadn't finished and it was very coarse, not smooth like the small ones. I threw the others out and learned a lesson. She loves the teenie ones and we give her one a couple times a week ... she has a little "greenie" stool the next morning!
Like someone already said, they can choke on lots of things ... we just watch Toto all the time ... she is like having an "eternal toddler"!!
