ACT
Greyhounds must be muzzled in public places unless the greyhound and its carrier have completed a course in behaviour or socialisation training approved by the Registrar of Domestic Animal Services. A course has been approved in the ACT and details of the next course can be obtained by contacting Domestic Animal Services on 6207 2424.
When walking greyhounds in a public place they must be on leash and the walker must not be in control of four or more greyhounds.
Source: http://www.tams.act.gov.au/city-services/pets/keeping_dogs_in_the_act