Or a cat, or a bird. I advise against chasing down animals in the wild, but having animals in our lives has huge health benefits, from increasing our circle of friends and acquaintances to lowering stress.
Having a dog will get you up and moving, for both walks and play; will likely make you more organized (they’re sticklers for a schedule); will give you plenty of opportunities for a hearty belly laugh; and are always on hand to offer an ear or a snuggle when you’re feeling down.
If having a pet isn’t practical for you right now, you can visit friends with pets, volunteer at an animal shelter (bunny snugglers wanted!), look at pictures of animals online, or even get a stuffed animal to fill some of the gaps. (Seriously, before we got our current dog, I was going through a depressive period and bought a toy sloth named Cyril. Cyril lived on the back of the sofa, and sat on my lap while I watched TV. He was quite the critic, and would wave his long arms at my husband when he disliked a show and wanted it turned off. He was also an expert at the UK museum-themed quiz show, Quizeum. Claims he never got an answer wrong, beating some of the best historians in the world.)
Whatever way you choose to interact with animals, they can help you feel better in both the short and long term.