When I worked at the Humane Society, we had a couple of live traps that were about 2' x 2' x 5' that we used to capture dogs that had been living on their own for awhile. Dogs that are dumped in rural areas, and which manage to survive by hunting and scavenging, often become very timid and fearful of people. Trapping was the only way to capture them, so we could help them.
The largest live trap I found available online just now is 48 in. wide x 36 in. tall x 96 in. long. It's intended for feral hogs, wild dogs, cougars, etc. It's roughly the size of the back of a full-sized pickup truck. And if it's gonna hold a hog or cougar, it's one tough trap!
BTW, if you're thinking of trapping an animal, you might want to phone your nearest F&W office to see if there are any special regulations you need to observe. Where I live, you have to have a permit to trap anything. You just go to the F&W office and they give you the permit ... which is free ... and if you want, they will rent you an appropriate live trap for a very nominal fee, which is 100% refundable when you return the trap.