This is a hard choice for me. I have had a dog in the past and I really was very close to her, and I felt as if I could understand her very well. I have had a cat too, and I was very close to her as well. I suppose since I can't choose both, it would have to be a dog. I will never ever forget the times when I was sad, my dog had climbed up onto my bed and she had put her paw on my arm as if she was trying to say "It'll be okay.. I'm here, please feel better.". Remembering this brings sadness, but some happiness to me. We had to get rid of that dog as my mother couldn't afford her. I will always love and miss her. I also remember the time I was dog sitting for my friend, and as I got a bit homesick, (I decided to stay overnight and sleep on the couch) the husky came over to the couch and lay next to it and let me pet her until I fell asleep. She actually did that several times.
So, seeing as I have had wonderful experiences with dogs, I suppose at heart I am a dog person. Though I do love cats. The ones I have met are total sweethearts, and when they want attention they will climb up onto your lap and encourage you to pet them. These said cats are my best friend's, and they are big pathetic babies! They are still adorable, though.