As some of you may have read, my dogs TEAR up kongs! They love them but it's hard to spend $20 on a kong they will destroy in 20 minutes (and I do mean destroy! In 20 minutes, my AmStaff Faith will have a XXL black kong chewed in half!). So I am wondering if anyone has any experience/knowledge of the blue kongs. I saw them in a catalog and it specified they were designed for use in SCH training (I must have missed where kongs were involved in SCH training, but ok) and are only available to vets and K9 police trainers. Some of the information I have found since says they are stronger than black kongs but some says they are the same strength as black but are radio-opaque so they show on xray. Does anyone know??