I have a dog who I often walk off lead where there are no roads, however have run into stables and barns countless times that I did not know were there. I think having a sign up warning dog walkers about the barn would protect both the animals and humans.
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Currently, seeing a barn creates panic for both me and for my dog who has recall, but when I call her back but may bark at a horse first. So I think having a sign up warning dog walkers about the barn would protect both the animals and humans.