Pray?

1. If the dog is already on you and you have a hiking staff, you've failed to employ it effectively. Assuming you have nothing else available and haven't been taken to the ground, you could try putting out an eye as suggested by one of the articles linked earlier. Let's say the dog has one hand, as that frequently happens. It's going to lower its butt and try to drag you around. Get your feet set so you can't be dragged, then reach in with the other hand and scoop out an eye. Then the other one if it doesn't let go. As it lets go (assuming it does), kick it in the ribs, hard, and yell at it (you're probably already yelling lol). Oh, but you have to drop the staff to do that, and you still have more dogs waiting to get you. You could try a bluff rush at them and scoop up your staff. It may delay the next attack enough to let you get the staff back . . .or it may not. That may not have been the leader. It may have been the sucker they sent in to test you out or distract you. Packs of coyotes have used similar tactics to take out livestock guard dogs.

2. You're screwed. A fixed blade knife is fairly inadequate against multiple dogs, or even one determined dog. Each one has forty-two knives. Each one of those knives will be driven by the full weight of its charging body. Your knife has to find well-protected vital bits to kill one, and dogs have been known to fight and continue to do serious damage to people with what would otherwise be fatal knife wounds. For that matter, knives don't cause much trauma. If your knife has a pointy or hard bit on the butt of the handle, you can try hammering the dog that has you on the crown of the head repeatedly. It'd probably be a bit more effective than stabbing.

3. I don't really have an opinion on stun weapons. I've personally been shocked by the hand held arcing type and taken them off the person doing the shocking, but that was in the early 90s, so maybe they've improved. If you're talking Taser technology, then you've basically got a one shot weapon. Eventually it'll run out of current. At best, you can take one dog out for a bit with a taser, but you're out of luck with the rest of the pack.

4. Try not to shoot whatever dangly bit of yours the dog has, and put one (or more) in its head at contact range. Position yourself with your back to something, and proceed to shoot the other dogs. Non-lethal shots will either cause a dog to flee or enrage it. So, I suggest shooting one at a time until it's fled or dead, while keeping an eye on the others.

5. Dog spray may be seen as a goodwill gesture. After all, no dog likes fleas and ticks. :^) Oh, you meant the other type of dog spray! It may or may not make the dog chewing on you already let go. It's definitely worth a shot, though. If you can get to a standoff situation, it may be effective in deterring the pack members that aren't fully committed to an attack, so I'd say apply liberally in that case.