Very few dogs are on anti-depressants.

It's worth noting - as far as just being happy in the moment and not letting things get to you unduly, dogs are head, shoulder and tail ahead of people.

That established, it's come to my attention that plenty of humans are prone to periods of mild to moderate depression (any more severe that that and you really shouldn't be talking to a dog about your troubles, you should be talking to a trained therapist.  You might also mention to them that you've taken to talking to dogs, as long as you're already there....)  Since I'm assured by reliable sources that the big three antidepressants preferred by dogs (Drinking out of the toilet, scooting, and licking your own snack-basket*) are for some reason off the table for the human population, here I present instead an overview of things people can do to cure those 'I only got two legs blues'

*If I might quote Bobby Cobb

A warm bath

-Surprisingly not as effective at curing depression as it feels like it should be.  Turns out that we use the word 'Wallowing' for a reason.

A brisk shower

-More helpful than you expect it's going to be.  Plus it never hurts.  Unless you're a wicked witch or made of sugar.  Then it would probably hurt.

Going for a run

-Less helpful than it feels like it should be.  Mostly it just allows you to reflect on how much less good of shape you're in than you would like to be.  Plus you get all sweaty.

Working out

-Same as for the above entry on Running, except with the added bonus of being surrounded by people who ARE in better shape than you are.

Meaningless Sex

-Well, now this depends on what you're depressed about.  If your depression is centered around 'I'm such a tramp, I'll never find true love because I'm giving the milk away for free, etc.' than this is not your option.  If your depression is based around 'I'm so unattractive, no one would ever want to have sex with me', than this one is golden.

Meaningful Sex.

-If you have access to this, what are you depressed about?

Buying yourself something pretty

-Again, it depends on context.  If you're sad because you have no money and you're about to miss another mortgage payment than this one is probably not a great option.

Hearing about the discovery of Doctor Who episodes thought to have been destroyed forever in 1974 turning up somewhere in Africa and about to be released on DVD

-Amazingly effective.  Bit hard to orchestrate though.

Drinking at home alone in the basement

-Turns out that this is 'unhealthy'.  Yes.  We were all surprised.

Snuggling up under covers with a dog and watching the entire Key to Time series.

-Best.  Thing.  Ever.