I don't know. I got Alex at 10 weeks old and have not had any hypoglycemic problems. He did not chew worse then any other puppy would do and he adapted quickly to our lifestyle. As a matter of fact, that little bugger did everything to make me love him. I had a hard time the first week because he was so different of my lhasa and I haven't had a puppy in 12 years. I was kind of overwhelmed. One side of me wanted another dog, and the other side didn't.