Well ya learn or hear new things everyday .? Our bloodhound is used on lead for the fact he will not stop once on a track and nothing to do with how he smells his own scent. I would trust this dog in anybodys house if they are home or not same as my English Setters yet my friend has a Setter I wouldn't trust outside let alone inside. lol
It comes down to training in that respect yup they do slobber and I would read up on them but as far as the rest - mere speculation and opinion