In the UK the the Dangerous Wild Animals Act was introduced in 1976, it was originally introduced as a private members bill due to the public response
and concerns regarding the the keeping of dangerous pets, especially big cats.
In the 1970's in certain higher social circles (i.e. people with no brains and lots of money) developed a fad where people would strive to own bigger
and more exotic pets. Public concern grew as certain people started introducing large carnivorous cats into their homes and gardens. An effort to
control this lead to the Dangerous Wild Animals Act.
Seeing as owners had to dispose of their pets after the act was passed, the zoo's found themselves swamped with requests to take on these large
carnivorous cats. In the end they refused to take any more, as a result the large cats had to be put down.
A number of owners admitted to releasing their illegal pets into the wild rather than have them killed, although it's unknown whether they would have
survived and bred from 1976 up until this day.
I've heard of several attacks by ABC's (Alien Big Cats, sometimes also known as Phantom Cats) on humans here in the UK, leaving said persons with
severe lacerations. I've also heard of a dog being mauled to death by one, unfortunately I cannot find any sources on this. There are also lots of
mutilated sheep in Devon which are said to be a result of the Beast of Bodmin Moor, another ABC.
Edit: Eek! Grammar!
Edit: Found a reliable source for the dead dog
here. It mentions armed police hunting the
culprit. I've also heard of the British Army being mobilised in Devon or Wales to hunt them down too!
[edit on 27/1/2006 by FactoryLad]