The can be sprayed in the eyes ,or cattle prodded out of action ,then they are of no use,but even if they do bite you most probably get the pull off plod,
Just in this day of age they are a liability,for MOST people,if I lived in a remote rural area then maybe,but when you have a property where postmen ,neighbours,children ,knocking on the door,I'd rather leave it but if you feel you need one crack on