DogWatch Hidden Fence recommends that the receiver collar be removed for at least several hours per day to ensure no pressure sores (pressure necrosis) will develop on your pets skin. Pressure sores may develop by having the collar on “too tight, for too long”. Longer furred pets can have a slightly greater chance of sores developing, especially after swimming or being soaked with water. If sores are evident, remove the collar and wash the skin with a Dettol type of cleanser and allow to dry out and heal.