Yes, but how BIG ?
That depends on how big you are

Don't buy something that is hard for you to carry around and control while you are running from corner to corner. It may be better to buy smaller (medium) sized ones than a big one.

Fighting small fires with it means standing in place ( almost ) but fighting a live ( 2-legged or 4-legged ) creature with it could mean jumping here and there while holding it with ONE hand. A really big fire extinuisher may be too much to carry in a confrontation (unless you carry it on one of those foldable luggage carriers, but even them you will have maneuverability problems).

Besides, when you have two medium sized fire extiunguishers instead of a BIG one, that gives you several options like you and your roommate each carries one of them, or you use one and then may lose one battle, retreat to the next room, pull the other one and start another battle.

Our friends and relatives still laugh today about me using a fire extinguisher for self defense back in 1995 when some drugg addict ran into our house through the open garage door where I was working.

Details please!

wasn't much more than that, had just gotten married and bought a house and was in the driveway with the garage door up replacing the rear shock/strut on my wife's old car when one guy came running through our yard being chansed by another and ran in our garage and into the house. I went in after him pulling the garage door down and ran into the houe then grabbed the phone and picked it up and heard my wife talking to someone and told her to hang up and call 911 as this guy started going through our kitchen drawers looking for knife. The closest think to me was the fire extinguisher so I grabbed it and pulled the pin and kept it pointed at his face the while he explained that some guy claimed he stole his drugs or drug money and tried to beat him up and he ran. Eventaully the police came and the guy chasing him was long gone so the police just pulled up and sat in their car so I had to walk they guy out to them.

"...the police just pulled up and sat in their car..."

Amazing, simply amazing...

God, how I hate domestics...

"...the police just pulled up and sat in their car..."

Maybe they didn't have a fire extinguisher.

Sue

YOU are responsible for you and yours...

The police just do the paperwork after the fact.

LOE also has the coroner on speed dial, and I'd have to look up the number.

They did the same years later when two kids on drugs drove into the side of our house after bouncing off my truck. The kid lied and claimed he was teaching his GF how to drive and she hit the gas instead of the brake when they turned into our driveway to turn around but there were skid marks in the road from where they turned in so fast. They then provided false proof of insurance and the girl driving got cited for failure to maintian control and over two years later my insurance company is still suing them for the damages. It took the police so long to get there they were able to walk down to the boyfriends house and flush their drugs and change their clothes to get rid of the smell. It took two more years to get our house sold and get out of there.