I have a long yearling that is a huge busy-body.  I'm wondering if she will outgrow this stage or if it tends to always be part of who they are.  If there's a fence she leans on it, she chews on anything she can get ahold of, if she's tied too close to the brush bucket she empties it, she mouths every latch until it's open so everything has a clip on it now, she's chewing on my mares tail across the fence, and now she's figured out that she can lean against the hot tape until the insulators pop off if she's wearing a blanket.

She's 2 in February and I plan to send her off for 90 days, so maybe once she has a job she won't be looking for work she shouldn't do?

Is she in a dry lot.  They tend to be bored when they act like that.  Out to pasture they find things to entertain them.

I have almost 2 acres that is cross-fenced - she's on one side, my mare on the other.  She has a stall with a large covered run attached and the gate is always open so she can go in and out for hay and water anytime she wants.  I never lock her in.  She tends to be curious and if we are out there spreading gravel, running the tractor or power tools, she's right there checking it all out.  I don't know how much of this is her personality or if it can be typical of them at this age.  I haven't had one this young to compare to.

We've had several youngsters around.  They're all different.  Some are content to act like mature horses and some are ornery and full of energy.  Yours sounds like there might be a little Dennis the Menace in her personality.  I wouldn't worry about it for one minute.  She'll change as she matures most likely.

I have a busy bodie (Melvin) He was like this when I got him as a 5 year old and hes even worst now and hes going on 20, lol, hes got the best personality and really I would not have him any other way, hes just Melvin. If he was not into my business I would worry that something was wrong with him.

I really  adore her personality.  She's VERY different than the mare I've had for 15 years and I am enjoying her friendliness and curiousity.....  To a degree....  lol.  I just get frustrated that I have to look out my window several times a day to make sure she hasn't gotten out or done something silly.  Nothing is safe within her reach - if it isn't made of stone or steel and isn't bolted down she will chew it, push it over, tear it down, or find some other creative way to destroy it if I don't get it caught in time.

She isn't even necessarily playful - just destructive 

Maybe get her some toys to mess around with :)

Like one of those really big/giant balls for horses to roll around..

Or put a couple of plastic 50 gal. barrels out so maybe she would roll these around to. Just a thought

I have one about to turn 7 that has to mess with everything. Doesn't matter the workload she's under. She's got to mess. She broke her jaw on the latch to her stall door, by messing with it. Then shook it off and went right back to playing with it. When she's turned out she's just out there messing with stuff, whether its playing in the water or carrying around sticks like a dog. If you're cleaning she will push the wheelbarrow over, try to steal the fork from you, eat your hair, etc. She will leave her food alone just to mess with you if you're there. I can't be around her when its food time or she won't eat. It's like living with a 16h toddler alllllll the time. Makes me appreciate my geldings that just like to be left alone. Yours might get better with some work, who knows. But mine's like yours, once she does it once and it works, like the fence thing, she's not stopping. Mine have a wood fence, but she's figured out how to eat through it or she gets on her knees and kind of sideways and just eats under the bottom board. She has a permanent divot in her neck from it. She got her head stuck in the gate once, thats so far the only thing I don't think she's tried again. She won't play with balls or toys either 

My 8 yr old gelding is never going to outgrow being  total nuisance.

Example - three days on the road and tied to trailer when not running.  Day three he some how opened escape door and pulled out bale of hay, several full hay bags, couple of fans and some buckets all inside of ten minutes. He was just standing there surrounded by his "stuff", with one foot thru the bale if a bucket munching on hay

The other day my husband sat down a small propane tank by the barn gate while he went inside to get something else.  One minute later when he returned my horse had rolled the tank about two hundred feet into the pasture.

He will untie himself, untie his friends, pull off their fly masks, just anything to be a total PIA.  Being around him is like being slowly pecked to death.

This is my busy bodie Melvin.

I have a 6 year old gelding who is a major PIA!  Has to touch everything with his nose.  LOOKS at EVERYTHING but not a big spooker.  Constantly picks at my mare (who will kill him).  I don't think it will ever change.

You described my yearling exactly!  While I love him and he has a very curuious personality, sometimes trying to do chores he is a pain. Tips my wheel barrow over, steals my broom or manure fork.. lol... he is alwasy into something!  I really hope he is going to be fun tho. 

I'm home, trying to work, and she pushed through the 2 strand hot tape again and got in with my mare.  I could have left her, but as I watched out the window she began pushing against the field fence that borders forest land.  I went out and locked her in her stall until I have time to deal with her.