These are very new in the pet shops and are made of hard plastic and look almost like a 1 foot high giant tack. The tack is impregnated with a Pheromone that causes the dogs and bitches to urinate on them. You hammer or push them in the area you want the dog to urinate and hey presto. Believe it or not it appears to work in some cases. Though some dogs decide it is a toy.

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