I admire you to offer to walk this dog - B' wrong - but in all honestsy if I were you I would not be tempted to walk him with my own dog initially - if you could walk him on his own and try to install some sort of dicipline first. There could be a danger that walking the two dogs together (even if yours is well trained) that your dog may try to lead and hence pick up bad habits from the other dog
Maybe I am wrong - but if I were you and had the time i'd try and spend sometime with him on his own first.
Bless you
regards
DT
xxx