Whilst compiling the list of alleged Nessie carcasses, this one completely escaped my mind. Richard Carter was an active monster hunter back in the 1990s and found this skull on the shores of Loch Ness which then went through various hands before it seems ending up in a Yorkshire landfill site. Richard Carter no longer is on the Loch Ness scene, but in a recent exchange of messages with me, he still believes there is something unusual in the loch and is drawn to the Giant Eel theory.
It is probably a cat, and I recall F. W. Holiday talking about finding a wildcat carcass during his shoreline searches. But it could be something else (though not necessarily mysterious) and does show that things are found around the loch, albeit not of a Nessie nature. It is a matter then of figuring out what exactly it is (I contacted Steve Feltham who was of the opinion it was a cat).
The comments below are taken from a website on Scottish Big Cats.