is it bad for a horse to sit ???

My twh mix loves to sit. He lays down as well. But laying down is natural for him..but is sitting??
He sits atleast 2 times a month..possibly more that's just the average I catch him doing it. He doesn't roll enless its after a workout or after a bath. So I don't think its colic
I have had a vet out she says he is fine and that its nothing to worry about if he normally does it.
Should I be concerned he is sitting??? He has done this all 5 years I have had him so its not new. Someone told me it was a bad behavior...is that true??

The only problem I can see is if he starts doing it under saddle!

Seriously though I doubt it is doing any harm. Horses generally don't do things to put themselves at risk and if it makes him uncomfortable he wont do it! The vets are usually always right, I wouldn't be concerned.

I don't see any harm

Are you sure he's actually sitting down? Or is he lying down to roll or take a nap, then just being lazy and only getting up halfway (so in a sitting position) for awhile before he decides to actually stand?

Hahaha he almost did it undersaddle once... let me tell you it was a crazy crop and leg day when he started... thank god I kept him from going all the way down. He hasn't tried it since.
The vet said it was fine so I guess I am worrying about nothing... just making sure he isn't hurting.

Bubba - no he actually sits to sit. I have watched him. He will walk around find a nice dirt spot sit down wiggle his butt around in the dirt for a few seconds then stay there for about 25 -30 minutes and then get up and go back to grazing. Like nothing happened. I thought a first it was an itch thing because he wiggled. But couldn't find the source no bugs, I only use fly spray and water and shampoo on him. And its never after I apply any of them. Its usually right in the middle of the day around 1 and around 5pm.
I have tried different sprays and shampoo to make sure it wasn't them causing it

Sounds fine. You should take a picture sometime!!

I will try he is such a big dope when he goes to plop down lol

Maybe he just likes to rub his butt. Alli has her low branch butt and withers rubber and can stand for ages just rocking and scratching, does it all year round and doesn't have any skin complaints ect, she is just being wierd

Perhaps he thinks he's a dog and its his favorite trick :P He stays there for half an hour until you notice his party trick then is contented enough that he has amazed you sufficiently so goes back to eating

I could believe it... he loves dogs but dogs hate him... lol maybe he picked up on our training techinques sit boy sit.. haha I should see if he listens