There is a "problem dog" park in Calgary. Located along the west side of Elliston Park is a fenced area where only one visitor is allowed at a time. One could post a note in the info board regarding the beast and owner. I believe the group managing the dog park would need to be contacted to allow access to the board. The gate is always locked and users of the park are issued keys.
Other signs would point at vehicles with stretched rear springs.
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