||They change your life complely. Never again can you do anything you want, free of care. For example, you cannot just hop on a plane or a bus and visit your friends for the weekend. You have to stop and think about who will take care of the dog. You can't even really go out for the evening without planning ahead as for your dog's welfare. Unlike cats, which can be left with a few bowls of water and a pile of dry food to get them through two or three days, dogs need constant daily attention. They have to be let out to walk at least four times a day, at fairly rigidly set hours. Same with their meals. You could leave a lot of food out all the time for them, but most breeds will overeat and become fat, and then die of heart disease before they're five. Speaking of which, you have vaccinations, licenses, spaying and neutering, toys, grooming stuff, obedince school... it never ends.
If you have a job, you can go work eight hours, plus commute time, and that's about it. If you stay away much longer than that, they will mess up your rugs, and proably start chewing up everything in sight. And the whole time you are gone, you will be thinking about the pain the poor animal is in trying to hold it, loyal beasts that they are. So you can't go shopping or go for a drink after work. You have to go straight home.
And then raising and training a puppy is a whole other challenge. They learn from every personal foible you have, and if you aren't disciplined and extremely consistent, they will pick up all kinds of bad habits that will haunt you for the dog's entire life.
It's like having a kid. Your carefree days on the club scene are over. I strongly recommend it for you. I think having a dog would really be a growth experience. You should first read something by the Monks of New Skete, like The Art of Raising a Puppy, or How to be Your Dog's Best Friend.
I do, I do, I do