This is an interesting sighting from a region that historically gets a number of sightings. I wouldn't normally suspect thylacine which was supposedly a very allusive animal to be present in suburbia but the area does have some cover, the beach and a near by reserve, so cant be ruled out. There is also rumours and reports of Tasmanian Thylacine's been introduced into southern Victoria around the turn of the 20th century by a Thylacine Preservation Society. Numerous sightings also come from Lock Sport and other regions of southern Victoria as well as the sighting from Maribyrnong that was also made to the T.R.U.
Only time and investigation will tell!