Two questions pertaining to dogs...

[welsummerchicks]

Both male and female dogs will lay on their backs like that.

As far as male dogs showing it, it's normal for that to happen.

And if it helps you any, someone actually did a RESEARCH STUDY of this, YES, at a university, I believe, and found the average number of times the average male dog moves it around in a 24 hr period of time.

Imagine putting THAT on your resume.

 

[dainerra]

the lipstick hanging out has nothing to do with neutered or not. It's just comfortable to "hang in the breeze" so to speak. Think of it like the Garden of Eden. Your dog doesn't know that he is naked; he is just lounging around the house.

Humping is, as others have said, more a sign of dominance unless there is a female in heat. Youngsters, though, will sometimes hump the air/grass when their hormones are first getting into full swing.

 

[Matthew3590]

It only happens to my dog when he stretches too far to one side to scratch.