
Bells work for dogs. My Delta learned to ring a bell to go outside (at 10 weeks of age). The bell is dismountable so a mischievous or chewing dog can easily take it apart and eat or chew on the "button" or other parts. I glued the pieces together to make it more secure.

PAWLAND Freestanding Dog Gate With Door: The Ultimate Solution For 80-Inch Wide Spaces, Stairs, And Doorways
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