The keeping of cats is much less regulated than the keeping of dogs.
Is cat registration compulsory?
Cat registration is not required under the Dog and Cat Management Act 1995 (SA), but may be required pursuant to by-laws made by individual local councils [s 90(2)(e)]. Please check with your local council. Councils can also limit the number of cats kept on premises - see Powers of local councils.
In most instances it is compulsory to microchip and de-sex a cat - see Microchipping and Desexing.