Prong covers are velcroed onto your pet's prong collar. As a result, your pet's prong cover needs to be measured to ensure a correct fit. Please refer to the diagram below for instructions on measuring for a prong collar cover.
How to measure your prong collar....
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For more instructions you may also view this video of
"How to Measure your Prong Collar"
Fore more Instructions for installing your Prong Cover view this video