Not an adult bear, no.
Two aggressive pitbulls with strong biting force can kill a wolf, and any lone wild dogs.
It will take 20 small dogs to kill a bear, and 5 large dogs to kill a bear.
One blue nose would kill it
One
A bear can only kill a human once, because a person can not be killed twice.
1
oh , that's simple. A polar bear can kill you.
a lot
Yes. A spider can kill a bear.
Goats don't kill dogs. There are incidents where pitbulls have killed goats.
Desiases that vaccines prevent could kill pitbull such as hepatitis, distemper, rabies, heartworm, and others.
No. A platypus cannot kill a bear. Not only would it not have the claws, teeth or size to kill a bear, but there are no bears in Australia.