Halt is what mailmen carry so it must be effective. My mailman was telling me that dogs generally hate mail carriers. They postulate that it is because mailcarriers have so many scents on them from handling packages from so many different people. Dogs find this upsetting.
I carry UDAP when I carry a spray but I don't carry any when I ride - only while hiking and not really for dogs, more for bears and cats (lions).
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