A NSW greyhound with a muzzling exemption (a Greenhound) is only recognised within NSW. If travelling to another state you must contact the relevant green collar issuing body in that state to find out the requirements for your greyhound.
ACT - www.greenhounds.com.au
QLD - www.greyhoundpets.org.au
VIC - www.gap.grv.org.au
SA - www.gapsa.org.au
NT and Tasmania - Muzzling exemptions currently not available.