I personally don't think that photo does anyone any credit or favours. I'm sure the dog's in fine fettle but the first thing that strikes anyone, especially the uninitiated, is how uncomfortable the dog looks. It's just conveying the wrong message.
That said, I'm sure that dog is the happiest thing, living the life it does, probably won't sit still for a natural photo so needs tying down for one. It's probably just a cultural thing and I hope Terriero doesn't take it to heart and continues to post more, particularly of his hunting in the field.