I love dogs in general, all animals really. I never had a dog as a child but have since had 8 as an adult over a large number of years (2 poodles, 3 shelties, 2 goldens, 1 aussie). I currently have a bi black sheltie who is very friendly. I suspect my sheltie, Obbi, might be my last because if he dies after a normal dog lifespan, I may be too old to get another, I don't want to re-home any of my pets if possible (Fish included).
I like the structure the dog brings, walking, feeding, grooming... I also like to see his joy when I come home. When I am stressed from work, he pokes me in the leg with his nose and says, "you will be much better off if you took me for a walk", and usually I am.
For me my dogs are my adventure companions, they have been with me in most activities including caving and mountaineering in the past. My current pup mostly does hikes and walks with us, and he was just recently, and successfully, introduced to canoeing last weekend. He is the least adventurous dog I have owned but right now that suits me just fine.