Having just noticed this thread, I want to commend all the responsible dog owners who have posted to it. I'm VERY impressed that so many people understand the concept and need for crate-training their dogs.
As a vet tech I saw SO many dogs who had problems that could have been alleviated if their owners had used a crate. I've assisted with many surgeries to remove foreign objects from the stomachs/intestines of dogs. I've seen burn marks on the mouths of dogs who bit into electrical cords. I've seen dogs that were deathly ill from chewing up sheetrock or carpet or insulation or window frames (wood slivers).
And dogs that are left outside also can run into many of these problems. Outdoor dogs can often have a high level of boredom, and so they learn to eat whatever is there. I've assisted in surgeries to remove ingested rocks. Some dogs eat huge amounts of dirt and get really sick. Many develop copraphagia (eating feces). Dogs that are left out in rainy/wet weather can develop what we call "rain-rot", a skin condition that causes loss of hair and infection. Hot spots are common in outdoor dogs. Health problems/conditions in outdoor dogs are often not noticed as quickly as they are with dogs that live indoors, too. When you have your dogs at your feet, on your bed, by your side every waking hour that you're home, you have a better grasp of what is normal for them and so it's easier to notice when something is "off".
And let's not forget the dogs that manage to get out and get hit by cars or killed by other animals. Don't think it could happen to you? I've seen dogs tear apart wooden fences. I've had firsthand experience with dogs that could rip open a chain-link fence in a matter of minutes. And, unfortunately, I have seen more than one dog die because a neighbor got tired of the barking and tossed it some antifreeze or poison laced hamburger.
While some of you may have been lucky enough to not ever have these sort of things happen, believe me they DO happen. Dogs are safer when confined properly indoors. If you have a room that you can dedicate to the dogs, that's great! But even in a "safe" room, there is a higher risk of injury than in a crate. There are walls and window sills and flooring that is accessible to your dog. And some dogs take full advantage of that.
And, also from the viewpoint of a vet tech, is another consideration that has already been mentioned. Many, if not most, dogs that are owned by responsible people will at some point end up at a vets (neutering, teeth cleaning, abscess, whatever). Dogs who have no experience with being crated undergo a great deal more stress than dogs who are used to it. To me, it's an owner's responsibility to provide their dogs with the tools they need in today's life, and that includes understanding and accepting that a crate is not a bad thing. And that goes to the next point (also already mentioned) about using a crate for travel. Can you really say what's going to happen in your life over the 12+ years your dog will live? Maybe you'll need to move, maybe you'll need to crate your dog. Imagine the fear in a dog who is not accustomed to being in a crate - and then you stuff them in and stick them on a noisy plane. To me, THAT would be cruel.
It is MUCH easier to ignore a dog left outside than one that is indoors with you. Most of the dogs that spend a majority of time outdoors have less human contact than a dog that is inside but crated as needed for safety reasons. When I stayed with my Mom last winter, I would let my dogs out for their last potty break at 2-3 a.m. and I could almost always hear a dog howling. This dog howled night after night, throughout the winter (an ALASKAN winter) and it was obvious that it spent most of its time outdoors. Was that kinder than letting it sleep in a crate by the owner's bed? I don't think so. And to stick a dog outside because it gets "too big"?? WTH kind of reason IS that? Anyone who doesn't realize that puppies become full-grown dogs is five beers short of a six-pack.
I live with five dogs - two German shepherds and three chows (curently about 240 pounds of dog) - and they are all inside with me. Yes, they get to spend some time outdoors. Dora, my ten year old chow, enjoys laying outside in the pen and she got a couple hours of "alone" time tonight after I came home. She was very content on her blanket in the bit of sun we still get here .. *L* .. but leave her out there longer than that? She'd be miserable. My dogs thrive on the time they get to spend with me, even if it's time laying at my feet while I type a post in here. This time is vital to their well-being, too. And right now I have a puppy, 15 weeks old, in a crate behind me. Yes, this is convenient to me. If I didn't have her in a crate, I certainly couldn't spend any time online - or watching TV - or taking a shower - or working on papers for my college class - or sleeping. To a young puppy, especially pups with a high energy level, EVERYTHING is a chew toy. I don't know anyone who lives in a place where a pup has zero access to electrical cords or phone cords or other items (books, clothes, shoes, sheets, blankets, chair legs, etc.). Heck, at 15 weeks my pup could certainly jump up and grab the computer keyboard and run off with it. And she's the type of pup who would, given a chance!
When I can watch her *like a hawk* she is free inside. When we're outside, I'm with her. I've found a local ball field nearby that I can use (now that ball season is over) and she gets to race around with the other girls. She gets a good amount of exercise, but I do limit her time indoors to when I can actively watch her - for her own safety.
My four adult dogs no longer need to be crated, although I do occasionally put Dora in her crate when I leave. That's truly her safety zone, though .. when the pup is out, Dora "self-crates" .. *L* .. she goes into her crate and the pup has learned that if she tries to bug Dora in there, she WILL get nipped. I know my dogs well (another part of responsible ownership) and I know that Dora sometimes is intolerant of the other dogs. So if I'm going to be gone for more than a short time, I crate her so that I don't come home to bloodshed.
Crate training is not cruel - in fact, it's exactly the opposite. Yes, it can be mis-used. But I see far more mis-use of dogs being left outdoors than I do of dogs being left in crates. Talk about convenient! You can stick your dog outside and just toss it some food and water, and you don't even have to be bugged while you sit in your nice warm home and watch TV (and no, I'm not saying that all people who put their dogs out do this - but it DOES happen way too often).
To the original poster: I have a question. I think you mentioned somewhere (and I'm not going back to look) that you've had several dogs and you've never had to crate a dog. I'm curious as to how many dogs you've owned as an adult, and what happened to those dogs. How old did they live to, and what was the cause of their death (or, if they're still alive, where are they now?). Your profile says you're 32 .. well, I have a dog that will be 16 this Saturday, another that is 11 1/2, another that turned 10 in September, and then the younger chow and the GSD pup. All of my dogs have lived to at LEAST ten years old. So it would seem that, with all the experience you say you have, that you'd still have some grown dogs. Even if your dogs only lived 12 years, any dog you'd have gotten after the age of 20 would still be around.
Melanie and the gang in Alaska