I want to take care of a dog
Why are you interested in one at this time?
Dogs are always there for their owner. If you have a problem, just talk to your dog.
I also have a dog, and I also do feel they need to sometimes take care of their owners in a way that I find cute, but owning and taking care of a dog is a big responsibility that is no joking matter. If you think you're really ready, how about you go to an animal shelter, and meet some of the dogs that are available.  The staff there can determine if you are ready to have a dog of your own.
A shelter? That's a really good idea, I didn't think about that. Thank you for the advice.
Because it is such a big responsibility, and such a big expense, to own a dog, you could also think about volunteering at the shelter.  That way you can always have dogs to talk to and take care of, but without the drawbacks of ownership.