Ever read The Five Love Languages by Gary Chapman? My dogs each have their own little love language.
Harley could not possibly survive without physical touch. He is in doggie heaven if only my fingertips would brush across him. When we go on walks, he checks in every now and then, touching his nose to my fingertips. He LIVES for touch.
Wyatt... quality time. He needs to be walked and to be played ball with. He wants to spend the first moments of the day nestling and snuggling with me. If he doesn't get his quality time, I can expect an over-hyper doggie zombie when I come home.
And Mocha, my roommate's dog, is all about receiving gifts... food, namely. He is a food hound. Whereever he can get it, he does. And if it comes from you, well, you are his new favorite person.
As you can see, I've got a lot of needs to fill.