I have three questions. First, I am wondering where I can find the most friendly dog. The only dog I ever got was a war dog and I was diapointed because it wasn't very friendly and only growled and barked. I am wondering where I could find a friendly companion (dog) to share Skyrim with. Second, Is their any friendly nice horses out their or any pets in general that are friendly I'de like to get one. Lastly, can I have some suggestions on what I can do in Skyrim. I am wondering if there is any nice thing I could do that I don't know about yet. Maybe a group I don't know about or something.

get Meeko ........hes a good puppy

You can find him near Meeko’s Shack found east of Dragon Bridge

Once you find Meeko he Will lead you to where his master’s body is, once you find the body you will be given the option to make Meeko a follower......

as for stray dogs you can find them randomly across Skyrim (PS you may never find one because they are very rare)

The best pet you can get is a Riekling Warrior found in Solstheim .........

Rieklings are considered as pets and you can get them after you do the Chiefs little quest,

the advantage of a having a Riekling Warrior as a pet is that they are the only pet that USE weapons like spears (there default weapon and they have a unlimited number of spears) but you can also give them swords & bows

and depending on the type of Riekling you chose warrior/ scout /archer you can give them very good weapons like daedric swords for the warrior & daedric bows to the archer & scout .........BTW the have a 25% resist frost

so they are great to use with human followers ..... that way its like having 2 followers at the same time ............and you can load both with all your gear so you will have 2 followers carrying all your stuff