Fighting off or killing a bear suggests victory over hostile opposition. Since both dreams have the bears on the outside getting in I would suggest that you in a current situate were someone is hostile towards you and you are currently battle against them.
The scorpion in your dream is a warning of danger from treacherous friends or associates, especially if you killed it; however, you will overcome the hostile influences if it bit you.
As a general rule dogs in a dream are a good omen and symbolize friends. Of course the interpretation varies according to the action and other details but is fairly straight-forward. If the dog was friendly and affectionate, it signifies pleasure and happy times with friends; a fierce or snarling dog suggests disagreements or untrustworthy friend; and if it bit or attacked, you are being warned to look out for actual deceit or harmful trickery from someone you have trusted. To hear a dog bark happily signifies pleasing social recognition, but if it barked fiercely, you are being warned of possible legal troubles, so don't fiddle your taxes or park your car too close to a hydrant. To see dogs fighting indicates that you may be called on to arbitrate in an argument between friends, in which case you must be extra tactful to avoid ending up the odd man out. If the dog in your dream was an exceptionally large one, it signifies protection through a powerful friend.
