Dogtra IQ Plus Additional Collar Mutt Mat you can achieve a secure

you can achieve a secure installation while maintaining the flexibility to adjust driver and passenger seats (or back passenger seats) for maximum comfort

while smaller pieces work well for lighter chewers

Size|Weight|Chest or girth measurement (Preferred Measurent)

XS Chest-plate is sold separately

Offers good hidden protection to lower and upper arm

Dogtra IQ Plus Additional Collar Mutt Mat you can achieve a secureAdditional Receiver Collar for the Dogtra iQ Plus Expandable unit. Package Contents: One Receiver Collar with ORANGE strap (with standard 5 8" Contact Points unless stated in the comment box), Splitter Cable 5 5