Hi, he's trapped and worried about strangers coming in close proximity, so is being 'defensively aggressive'. Telling those strange dogs in no uncertain terms, to get out of his personal space, to back off.
Interested to know whether you've done much tying him up in public in the past, whether this is new behaviour for him, after lots of non-eventful experiences? If that's so, and you know nothing's happened - a threatening dog has attacked him when he's been tied say - then I'd be concerned there was maybe a physical reason for the change, like injury or illness that's causing him to feel more defensive.
Interested to know whether you've done much tying him up in public in the past, whether this is new behaviour for him, after lots of non-eventful experiences? If that's so, and you know nothing's happened - a threatening dog has attacked him when he's been tied say - then I'd be concerned there was maybe a physical reason for the change, like injury or illness that's causing him to feel more defensive.
