Please see below a representation of what a Thylacine print should look like. Note that the toes should face slightly inwards and look for the presence of dermal ridges in the pads. The vast majority of prints that we see are dog prints or wombat prints. There are many wild or feral dogs in the wilds of Tasmania and other parts of Australia.
According to Pocock (1926), as sited in the great thylacine reference site, Thylacine Museum, The thylacine is digitigrade, meaning it normally walks on its toes. The feet of the thylacine differ significantly from those of dasyurids (Pocock 1926).
The pads of the feet are granulated rather than striated. The front foot (manus) has a small, largely non-functional thumb (pollex) which sometimes (although rarely) will leave an imprint in tracks made in soft mud. Unlike those of a dog, the thylacine's toes have no webbing between them. In canids, this webbing serves to hold the digits together when running. In the thylacine, there is a fusion of the three interdigital pads to form a single, tri-lobed plantar pad.
All the large dasyurids, Thylacine included, have very similar feet. One rock solid feature is the ratio of the size of individual planter pad of 6 to 7:1. This ratio holds for Eastern Quoll, Spotted-tailed Quoll, Tasmanian Devil and Thylacine in dehydrated and, as far as I can tell, fresh feet. The canid and felid equivalent falls between 2 and 3:1 (Mooney, pers comms, 1995)
Another characteristic of animal feet is the axis of the toes. On a canid or felid foot the junction is just behind the planter pad - as in the top image immediately below.
Whereas with the dasyurid the axis junction is almost the length of the planter behind as is seen with the thylacine print lower left and the devil print lower right. (Mooney 1995)
Mooney Cast - circa 2010
This print is held in the hand of well known Thylacine expert and biologist Nick Mooney. Nick suggests that this is etiher Thylacine or a fake - in either case he is suggesting that this is what a thylacine print should look like. It looks similar to the Tracker Scount prints - although this one is shown well after the Tracker Scout prints were destroyed in the early 2000s. Close examination appears to show a different substrate.
Print Casts - Fresh Dead Thylacine
These are casts from the Victorian Museum, of a 20kg freshly dead thylacine. These prints are used as the official reference prints by the Tasmanian government. Nick Mooney would frequently send a photocopy of the print to people who had submitted prints in the hope of them being found to be thylacine.
Tracker Scount Prints 1991
These prints were first reported to the team by Tracker Scout. The image is from the documentary Devil's Island. In the show Rusty explains how he took the casts and destroys the casts in order to protect the animal. The prints have cause some controversy as Rusty indcated in a Facebook chat that the one on the left could be fake. This assessment was made as he did not see the animal that left the print. As opposed to cast on the right where he saw the animal by the side of the road. Some have accussed Rusty of faking the left print , however, analysis of Rusty comments clearly show that he is suggesting it COULD be a fake and not that he created it. Regardless, it looks very similar to the reference cast and the Mooney print.
Dead Thylacine Foot
This image of a thylacine foot was used to compare to a footgraph in Col Bailey's book - Shadow of a Thylacine. It shows the front foot of a thylacine. Note that the 'creases' or groves that divide the singular planter pad into three lobes are faint here. This most likely due to drying of the speciman.
Taxidermy Speciman
This particular photo shows a front and rear thylacine foot. On the front leg there is a distinctive line that appears to be a legacy of the taxidermy process. The front pad is missing the obvious separations in the planter pad which highlights the different ways that specimans are preserved.
References:
Mooney (pers comms) 1995
Pocock 1926
CAMPBELL, C. R. "The Thylacine Museum - Biology: External Anatomy(page 8)". Accessed: 24 Jun 2014, http://www.naturalworlds.org/thylacine/biology/anatomy/external/external_anatomy_8.htm