This may be a little long but here goes...
I awoke at five in the morning and could not return to sleep. My body was tense and loose at the same time as adrenaline slowly filtered out of my veins. It was the adrenaline and the piercing emotions that kept me awake, not fear. I sifted through the thoughts of the dream and this is what I could recall. Some things may be partial due to haziness of memory but this is as accurately as I can recall the dream at this time.
I found myself on a yellow school bus. Dave(an old friend) was in the drivers seat and we were parked outdoors on a patch of gravel surrounded by grass. The scenery will change between different mixes of places familiar to me but I do no think that aspect very important.
Dave left the bus and walked south, but in the dream it was north. South is the direction it would be in the scenery from the actual memory but for some reason real north and real south were reversed in the dream. I followed about a hundred feet before I remembered that my pet bear was alone on the bus(I do not actually have a pet bear). I thought to myself that I should take him along. Partly because he needed to stretch his legs and partly because it seemed that leaving him on the bus would be a bad idea. I walked up the steps and into the space down the middle of the bus. The bear was four seas back and seemed quite comfortable. He was a black bear at this time, a little smaller than myself and very tame; like a lazy dog. I had memories in the dream of how I used to have fun times on the bus with the bear and with friends while on road trips. It was a long history and the bear was indeed like a dear pet. I led it off the bus as if to follow Dave's footsteps.
I was in front and turned to help the bear down the steps once I was on the ground. The bear slipped awkwardly down the steps with what looked like a very painful twist of both its front feet. When it was on the ground it seemed to be alright though. I was a little concerned but it appeared to be fine. The next moment we were standing beside the bus and the bear was changing. It had become more brown like a grizzly. Mostly the brown was one the belly and its back was still black. It had grown larger though and was about six feet high standing on all fours. I urged it to come along and walk with me but it hesitated. This alarmed me because it was not something it had ever done before. I could sense its fear of me. It was like a wild bear that did not know me anymore and it issued a deep threatening growl that made my hair stand on end. I sensed that it felt I threatened it and it was ready to attack me out of its fear, so I slowly backed toward the door of the bus. My intent was to get back on the bus and lock the bear out. I wanted to run inside quickly but I thought running might trigger its instinct to chase and the door was locked anyway. I needed to unlock it with the key I had. If it started chasing me now I wouldn't have time to stick the key into the lock, open, get in, and close the door before it got to me. I kept inching to the door hoping not to set the bear into a rage. Just as I put the key into the lock it started charging. It was close but I made it into the bus in time to not get mauled. The bear hated me now and wanted to kill me. It was also fully brown and looked very much like a grizzly bear. I waited in the front of the bus for the bear to go away but I didn't see it outside. For some reason the back door to the bus was open and it came in that way and came at me. I barely had time to get back out the front door with my life.
Outside the bus again I felt less trapped but in a great deal of danger still as the bear wanted for certain to take my life. Hope revived as my little brother came running from the east which was west in my dream. He came out of the trees. I ran with him a little ways but then he hung back to fight the bear. I realized he was right, we could run forever because the bear would've chased us forever. We needed to fight it and defeat it. My younger brother somehow now had two chainsaws though the one in his left hand was broken. He ran toward the bear which ran away at first. James cut the right leg on the outside thigh area with the chainsaw. It was really a small cut, nothing life threatening but it was enough to slow the bear and show it also to be vulnerable. After the cut the bear turned back on him to fight. He held it at bay with the chainsaw though. It snarled and growled in rage but wouldn't try to attack him as long as he held the chainsaw between them. About this point my older brother also joined the fray but against me. He wasn't with the bear but he used it as advantage to try and kill me but unsuccessfully. This hurt me deeply. He was my brother had just tried to kill me. Then I was given a chainsaw but it had no blade or chain so it was useless. I was left to fight the bear while my younger brother fought my older brother. For some reason the bear suddenly had a weapon too. I don't know what it was but it was red, plastic, about 5 foot six inches long, 18 inches wide, 2 inches deep and had some motor at one end. I would know one if I saw it but I'm not sure if it actually exists. It wasn't actually a weapon but the bear wielded it as if it were. With only my useless chainsaw which had no chain, I ran to the house. The house had not been there earlier in the dream but it was there now. It resembled the house I grew up in.
The bear came after me but I found a baseball bat inside and used it to club the bear. I slammed its head and clearly stunned it. I smacked it solidly with the bat three or four more times. It had tried to get back outside the house. It had followed me in when I ran from it. When I knocked it out, it was on the porch near the front door. It had changed into a polar bear by this time and my blows had left bright red bloody spots on its white fur.
Both of my brothers came into the house and we all met in the kitchen. I took from older one several weapons he had intended to use to kill me. My younger brother and I were now the victors, but it was a bitter victory. I held one of the pistols and pointed it right at my older brother chest. I spoke no words but the thought was so loud we could all hear it. “If you ever do anything like that again, I will not hesitate to kill you.” It disturbed me to think that about my brother, especially since I knew that I meant it. It pierced my heart that he had tried to kill me. I knew I could never trust him now. Even though I chose to spare his life we could never be friends again. I would always have to watch my back.
I walked out to the porch area where the bear still lay unconscious. There was an open wound on its chest. I was confused because I had only struck it in the head. I knew somehow that I was also responsible for the wound though. It was open and bleeding, and maggots were already beginning to infest it. I knew the bear would die. It looked younger now and less ferocious. I was ready to strike the death blow with the baseball bat, or however many blows it took to crush the skull in. As I raised the bat it regained consciousness though and I suddenly lacked the will to kill it. It was no longer a threat to me. It slowly got up and limped outside. I watched it walk to the left which was north. It was north both in the real memory and in the dream this time. I felt sad because the bear now was once again the original tame pet. But it feared me now in a terrible way that made me feel bad. I had only done what I had to to live but I still felt like now I was the monster. I still had affection for the once again tame pet. But now I had driven it away and I knew that the wound in its chest would also mean its death. I felt betrayed too. It had been the one who attacked me first. And my brother too. The feelings overwhelmed me and I woke up. I awoke at five in the morning and could not return to sleep.

As added background, I actually have a good relationship with both my brothers so the betrayal of one was both unsettling and very shocking. For me, it was extremely vivid, colorful, and generally realistic. It was the kind of dream that felt like it certainly had some kind of deeper meaning though, maybe even somewhat prophetic (though of course not literally). If someone has any insight, I would greatly appreciate it.

Hi and Welcome!

What I sensed at the beginning of the dream was that you are a quick thinker when you have to be. You may find yourself in a dangerous situation but would be able to handle it whether you realize it or not. Were you in a situation recently that required quick decision making?

I'm curious about the directions. North is south and east is west. Do you sometimes feel you are being pulled in two directions at once? Perhaps the pet bear represents someone or something that you have outgrown and must leave behind or it will bring you down. This could be part of the direction you need to take with your life.

The brother's betrayal could represent someone that recently let you down that you may have thought of as a brother---a close friend or relative?