Petsafe Stubborn Dog Add-A-Dog® Extra Receiver Collar - Manual (Page 12)

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If the condition persists beyond 48 hours, see your veterinarian. •
Your dog’s neck and the Contact Points must be washed weekly with a wash •
cloth and mild hand soap, then rinsed thoroughly.
A condition called Pressure Necrosis, which is a devitalization of the skin due
to excessive and prolonged contact against the Contact Points, may occur if the
steps above are not followed.