So as long its not your pet its not ok
I would have good reason to shoot the dog if it came on my land
and yes it is legal classed as a threat to my family.
Source? Unless you have sheep instead of cats, I think you'll find that you're very much mistaken. How does a dog killing or attempting to kill a cat (in your hypothetical scenario) constitute a threat to your
family?

I find it bewildering that finally, after nine or so pages (not the man-sized ones

) that the antis start crawling out of the woodwork admitting that actually, it's pretty much the fact that someone enjoys hunting that winds them up. It was the same on my ratting thread; if they have to die, so be it (but we don't like it)... however to enjoy the activity is a mortal sin.
What rot! To push through legislation (with about a million quid as lubrication for the wheels of 'justice') based around emotive, subjective puritanism ("OMG they enjoyz it!!11eleven") which ultimately has no reflection on real-life animal welfare is just stupid.
One of our resident antis keeps taking pains to point out the 100,000 or so foxes killed annually on our roads. Ignoring for a moment the ludicrous statement referring to cars thus killing 'what few we have left' (paraphrased), your (antis') tenuous emotive argument would be best aimed at motorists.
Motorists kill more foxes than do mounted hunts (I won't count the real pest controllers, lurcher and terrier men

). Motorists kill other motorists. Motorists kill pedestrians, and - shock horror - motorists kill human
children. Want to know what's worse? Not only is death by motor vehicle generally slow, and excrutiatingly painful, but these murderers actually ENJOY driving!

OMG won't somebody please think of the children?
Sod the hunting ban. Ban driving, you'll save more lives - animal and human. How's that for emotive decision making? Let's make a LAW so we can all whine about people wanting to break it.