A collar (1000) for an animal comprising an elongate strap member (1001) and at least a first and second housings (1011, 1013) at each end of said elongate strap member (1001), each of said first and second housings (1011, 1013) comprising interlocking means (1021, 1023) such that said first housing (1011) releasably engages said second housing (1013) in the proximity of the underside of an animals neck when the collar (1000) is fitted around said animals neck.
