I'm just gonna throw this out there after the last couple posts.
I don't think it's possible to be depressed with a dog. The dog cares about you unconditionally. The dog knows your mental state isnt great (don't ask me how, but they fucking know. When I'm sick, the dogs never leave the bedroom. When I'm sad, they bring me toys. It would cheer them up, so they figure it must cheer me up). The dog is a living being that requires food and care and attention. It forces you to keep a schedule - the dog doesn't care that it's Saturday and you want to sleep in. Breakfast is at 630 sharp. Petting dogs seems to make you happier than it makes them. They've got floppy ears that are super soft to play with. If you're not a piece of shit owner, you know your dog needs to be walked, so it forces you outside, and vitamin D and fresh air and exercise are all main components of not being depressed.
And the dog is happy to see you every day when you come home. It's never mad at you. It never bitches at you for not doing the dishes. And it will listen to you vent all night long.
I was tired as fuck, and I'm stressed as fuck with shit going on with my homeowners insurance, and I fucked up my elbow which was helping neither of those problems, and the dog still comes up to me and stays spastic until I take her on a walk. Which calms her down and calms me down.
Can't recommend it enough. But if you get a working dog, buy a fucking vest and weight it down. You'll be happy you did.