Mimi,
I think it's great you are doing so much research before you get a dog!
First, though, you should not just "buy a dog" without your parent's permission. You are not an adult for another 5 years, and by law, your parents could take the dog away, sell it, etc, and you couldn't do anything about it. Not to mention that you need buy-in from your parents, because this is a HUGE responsibility. Can you pay for its food, spaying/neutering, regular veterinary bills (shots, exams), or emergency Vet treatment? A single regular exam on a dog plus yearly shots is probably around $80-$100. If your dog needs to go to an emergency Vet, you NEVER get out of there for under $200, and emergencies DO happen! The best bet is to show your parents your research and how you will take care of the dog and be responsible. You will get a lot further with that than with demands or just "getting one anyway".
OK... Assuming you have your parents permission, here are a few thoughts on your questions.
First, even invisible fencing on 2 acres would cost you a LOT of money. For that much wire, besides the cost alone, you would probably need some sort of amplifier because you would lose signal/current over that stretch. You would have to talk with a fencing expert.
Second, I don't think a Siberian would ever respect that invisible fence barrier, shock collar or not. If he/she saw a rabbit on the other side, they would bolt full speed over that without a second thought. Sure, she might get a zap, but once they did, they'd be going full speed and would be away in a shot. Once your Siberian is loose, they are at danger of being stolen, hit by a car, or killed by a predator (if you live in what sounds like a rural area). Also, they only come back when they're tired and hungry and may forget the way home. The best bet is at least a 4 foot high picket fence. Who's going to pay for this fence? A decent sized fenced area (say 3 sides off the house at 30 feet by 100 feet) would cost upwards of $1000-$2000 depending on materials. My Sibe respects her fence, but still digs under it to try to get to prey.
That brings up another point. A Sibe will dig up your backyard until it looks like the surface of the moon. Your parents won't like that.
Whether you're the "Alpha" or not, that will not affect their primal instinct to run, explore, and hunt! Also, Siberians are very stubborn and independent, and you'll be surprised how much they will NOT listen! You're lucky to get them to want to do what you want to do. It's more in the vein of convincing/enticing them to what you want to do.
Next, if you get a Siberian, your cat(s) are in extreme danger. Sibes view birds, squirrels, possums, racoons, mice, cats, rabbits, and any small mammal as food. You cannot convince them otherwise. If it's a young puppy when you get it, you may be lucky to get them to accept them as part of the pack, but when it grows up, you could be in for a tragedy.
Noise is minimal. Most Sibes are dead quiet unless they REALLY want something bad! They don't incessantly bark like some other breeds (Labs included).
Shedding is TONS twice a year. I think you could deal with that, too.
The biggest concerns are costs and restraint. You can teach a Lab to stick around you and not wander off because they are so protective and loyal. They are also not so headstrong. You can NEVER take a Sibe off-leash outside your fenced property.
Assuming you get your parents' approval, I think a Lab mix would be the best choice for you. Purebred Labs are prone to hip disease, and a mix would hopefully be less susceptible. Also, this dog would help protect you, your house and property. A Siberian would welcome an intruder in with open paws!
If you got this dog now (with approval) and you kept it its whole life, it would probably live until you're 26, at which time (or before, once you live on your own and have a job) THEN you could get a Siberian.
They are beautiful dogs, sweet with other dogs and kids, but aren't as dependent as other breeds.
I hope you take my advice to heart in your decision!!!
Walt


