Go to a veterinarian immediately
your dog could die
There are many ways to draw out an infection, from a bite wound. A person can squeeze the infected area, and push it out, they can use peroxide, or rubbing alcohol.
Yes, for example, a dog with Rabies can bite a person, pass on the infection and that person can die.
to the leg its just small scratch
As with any dog bite, there is a risk of infection if the skin is broken. See you Doctor if you have been bitten by any dog, and be sure to investigate to see if the dog is up to date on it's Rabies shots.
Peeing pus or blood means a bladder infection, most likely. Take it to a veterinarian before it dies a painful death.
It can - but you should never use it without supervision from your veterinary practice.
An infection should be checked by a veterinarian
I suggest taking your dog to your veterinarian immediately. Dogs have bacteria in their mouths (just like humans), so your dog probably has a bacterial infection that will require medication to get better.
probably rabies, unless you have an updated tetanus shot.
Not unless the dog had rabies or the bite was to a fatal spot, such as the neck. Also be aware that a dog bite to a cat can cause an internal infection. The bite may not fester or abcess on the skin, but the infection could become systemic internally. I know this as my beloved cat died this morning after being diagnosed by a veterinarian that a healed bite punctured her lung and introduced bacteria. If your cat loses weight, is not as playful, and more lethargic following a dog bite--even weeks after the fact, there may be an internal infection that is deadly without early treatment.
About $2000-4000 dollars depending on time it took to get the dog to the vet and weight of dog. The heavier the better turn out and recovery rate.
The most common sign of infection from an animal bite is inflammation