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In this June 30, 2017 photo, Apollo, a PTSD service dog, wears a "Do Not Pet" vest that was custom made for his size during a trip to the park in Gillette, Wyo. (Kelly Wenzel/Gillette News Record via AP)

In this June 30, 2017 photo, Apollo, a PTSD service dog, wears a "Do Not Pet" vest that was custom made for his size during a trip to the park in Gillette, Wyo. (Kelly Wenzel/Gillette News Record via AP)

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