We have the regular nylabones, but get the "regular" or "medium" size since 6 lb Emma is a POWER CHEWER! We also have the durable Dinosaur Dental bone...they LOVE it and fight over who gets to chew on it...and sometimes they both chew on it at the same time!
Here's a link to it! I HIGHLY recommend it!
http://www.petedge.com/Durable-Denta...ne-TF22101.pro