i would be so upset and embarassed if this happened to me my dogs would never be allwoed off lead anywhere near livestock again. OH drives past a field of sheep on the way to work. A few weeks a go there was a dog chasing the sheep around the field owner was there too. Why oh why would you let your dog off the lead in this situationIt isn't a case of why let them off lead in that situation, deer are a predictable everyday animal in Richmond and I hardly ever see a dog on lead there (I don't go often though). That sort of thing can happen anywhere at any time outside a small local park situation, in which case other dogs, cyclists, joggers or kids screaming can and do attract some dogs, which might be anything from a nuisance upwards.
No matter which kind of environment there are these risks but if you train the dog as routine to recall from emergency situations there simply is not a problem, the dog goes, owner recalls, simple as that, no problem. Dogs chase 'cause they have these needs & they are needs, they don't go window shopping, they don't look at trees as if they want to paint or photograph them or look at the countryside as if its an aesthetic thing, they are evolved from hunters & when out they have varying degrees of the need to express that trait, all that is needed is train recall from chases to be on the same side & owner and dog can walking in any countryside for most of the day in safety & above all the dog will have been in its own natural habitat as a dog.
Thats not the only dog-deer vid on there, try this one.
http://www.youtube.com/watch?v=NYsduZjPGck.