I agree he has to have a different set of collar/lead... as being trained for service dog is way different as for show... he needs to realize that when in service he needs to heel closer and when at show he can go ahead....

this one shows a more beside handler gait (towards the middle and last part)

http://www.youtube.com/watch?v=nY20gMtnKSg

and heres another one (bad quality but you can see a more ahead dog than handler)
http://www.youtube.com/watch?v=T2wruTIDSzo

http://www.youtube.com/watch?v=bUvw1GaBG40