Over on the New Page website, Nick Redfern has written an article on large black cats in Britain, including ones able to stand on their hind legs. He suggests that these cats may be were-cats.
Now, the problem I have with were-cats or, indeed, were-anythings, is that to change from one creature into another does not involve merely a change on the outside, but a change of the internal organs as well. A human's internal organs are rather differently placed from, say, those of a wolf. The internal changes would be complex and lengthy.
How, then, do we account for notions of such change? We can always say that werebeasts do not exist outside the human imagination. However, owing to the frequency with which they turn up in folklore, one has to ask if there is another explanation.
Is it that a human can cover himself with a sort of aura which makes him look like a beast to witnesses, while he in fact retains his original human form. A human suffering from an intense form of psychological lycanthropy could possibly make his appearance seem different to the onlooker.
However, bipedal cats in the United States are not unknown to cryptozoologists. They have been reported in the vicinity of Mount Tamalpais (California). In 1948 one was reported from White Oak Swamp (South Carolina). Over the border in Canada, one was reported from New Brunswick in 1951. Could it be that small populations of cats have adapted to bipedalism? Or could they have wandered in from some adjoining dimension. Who knows?