Having trouble keeping weight on 30+ y/o pony

Pete gets 2lb of rice bran pellets, 1 scoop Nutrena Senior, vitamin supplement, and MSM split into 2 feedings a day. Plus free choice hay.

Over the summer, I fed him soaked alfalfa cubes instead of the senior feed, but he slowly started to loose weight even when I added more and more cubes so that's when I switched feeds. He gained back the weight for a while, but he's now loosing it again.

He's been dewormed and has had his teeth floated recently. He's lost 2 molars, and another one is loose. Otherwise, he's his normal goofy self.

I would like to know if anyone knows of any other feeds that might work better. The only feed store near by for me is TSC.

Here he is over the summer:

Have you tried adding vegetable oil? And beet pulp is amazing, I feed it to all my horses that have needed some help with weight.
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Triple Crown Senior. That stuff is amazing for older and malnourished horses. Rascal was on it after a bad bout of colic. I use it when rehabbing underweight/neglected horses as well.

I once took an old guy in that we had to chop hay for. We soaked it a bit with a mild saltwater mixture to keep him drinking since it was high heat summer when he came in. You might try this anyways, since his teeth sound pretty bad.

Eventhough he has hay in front of him 24/7 with a bad tooth, he's probably not eating as much as he normally would. Up the senior and instead of soaked cubes add soaked pellets. He doesn't even have to chew them. Try to meet his caloric needs with just the pelleted feeds (10# total for starters) and the hay will just be chew time. Adding 1/2 C per meal, is easy extra calories.

What kind of rice bran pellets?

We like Empower - wonderful stuff.

I have tried oil, but he's also picky about his food. I board him about 10 minutes away from my home, so I asked for him to stay in his stall tonight and I'm going in tomorrow morning and I'll see how much he ate over night. I figured if he doesn't clean up the hay provided by the barn, I'll start giving him the chopped hay. I never see those chewed balls of hay on the ground whether he's outside or in his stall. So I'm pretty sure he gets down most of the hay provided to him.
Another thing from when I fed him soaked alfalfa cubes, is that towards the end he would not finish it. He would eat all the rice bran, but he'd leave a few handfuls of soaked cubes. I would soak those cubes until they were mush, but like I said he can be picky.
When the vet that came out to float his teeth she was actually surprised he was still living because he was considered old when she used to shadow another vet in our area. That must have been about 7 years ago. Besides his teeth, he has huge knots on both his knees from arthritis. Before I got him, he'd limp every time he took a step, but since I started giving him MSM I haven't seen him limp since.

Max-E-Glo.

TSC has chopped hay. TNT I think is the name of it. I had an old one who couldn't eat much for hay. Mostly he chewed it up and spit it out. He could eat the chops. He got that with alfalfa pellets and soaked beet pulp along with a complete pellet.
He did seem to be able to chew green grass so things would get cut back as the grass came in.

My 30yr old also lost weight last year. He is currently on 3 feeds a day of Allen and Page old faithful, Alfabeet and flax oil.

We also have him in the yard for most of the night (he doesnt stable well) and he is fed Chaff as he cannot chew hay and as he has no front teeth he can't get the grass either.

He is piling the weight back on and looking amazing!
The trick with old horses is to feed several times a day. Thier system can only digest a small amount at a time so if you feed them too much in one go it doesnt digest properly.

With harvey we are about to up his feeds to 4 times a day!

I've had trouble with my old pony's weight for years. It got so bad last year he was eating free choice hay + 4lbs of senior & 1lb beet soaked pulp and a vitamin supplement each day. Since he is less than 13hh, that was a ridiculous amount for him to eat and still look thin. I switched him to 2lb. Senior and 2lb. Omelene 300, in about two weeks he was starting to get plump so I backed off on both. Now I have him eating a normal 9lbs of hay 3/4lb senior 1lb Omelene, the beet pulp and vitamin supplement. His weight is finally perfect and has been for months.

I know I'm going to sound like an ad for Purina, but even though the Omelene costs more than anything else I've ever fed, it has cut my pony's feed bill nearly in half. A month or so after he came up to a nice weight I tried taking him off the Omelene(because it's stinking expensive!) and switching to a cheaper sweet feed, he started dropping weight immediately and I'm back with Omelene.

He doesn't look thin to me, however I would try soaked beet pulp (3 parts water to 1 part BP) and a senior feed.