The New Fall Flat Dumbbell is designed to prevent it being able to stand on its end after been thrown! It also has useful string chords to proof the grip and hold.  It comes in a range of colour styles - purple, green, yellow, blue, orange and black.  The width of the standard dumbbell bar (the strung part)  is between 8-9cm.  They can be made to measure the width of your dogs mouth, just email your enquiry regarding a bespoke size.