I agree that the plastic bottles are awesome I put the lids on real tight (sometimes Chopper takes them off he doesnt eat them ) and I put a few small bones in to make the bottles rattle they love them, Gypsy has a few little stuffies that are her favorite, but Chopper doesnt get them because in a matter of minutes he rips them apart, I use Kongs filled with cheese and hotdogs also beef bones, not rawhides...
Good luck
