10 year old gelding dropping weight fast, watery diarrhea, more...

I have a 10 year old tb gelding that has been a very easy keeper for the years that i've had him. But recently he started dropping weight very fast. It started out as very watery diarrhea. He's drinking a ton of water and eating plenty of food but the weight is still dropping the muscle on his top line and hind end is half of what it use to be. His teeth were just taken care of in november and now that I look at them they look like they're going to fall out. He is on a strict deworming schedule. A vet is coming but what could is be? What should I ask the vet to test for?

Also I did give him probiotics and it worked for a week or so and now he's back to the diarrhea

I think the vet will have a better idea on what to test for. Given the extra intake of water and the extra water in the manure, I am thinking possible diabetes even though he is obviously not overweight, which is a typical cause. Another issue may be Cushing's Syndrome and after doing some more reading, and looking at your horse's coat, that one fits a little better. According to what I just read, a horse that has Cushing's can develop diabetes.

Good luck and sending healing thoughts...

When was the last time he was dewormed?

It could be a number of things. Kidney failure, diabetes, worms or bacterial/viral infection are just a few possibilities. It's good that a vet is coming out. I'd have a CBC done as well as anything else the vet thinks will be needed.

He was just dewormed a month ago. He's been dewormed on a strict schedule since I've had him.
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Have you checked his temperature? Capillary refill? Pulse? Is he having trouble breathing? (heavier then normal breathing)

Also, when de-worming, do you rotate de-wormers?

Yes I rotate dewormers. Temp is ok haven't done a capillary test yet and his breathing is normal no shortness of breath or heavy breathing. Pulse was good too. His stomach does growl very loudly and often it's kind of like a thunder in his belly constantly even after he ate
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Well, I'm out of thoughts. LoL. Hopefully it's something simple that the vet will know right away.

Thats what I'm hoping his teeth are deteriorating very fast in November they were fine now it's like they're wearing away too fast
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At only 10? Hmmm... Does he perhaps have ulcers? I'd have the vet check.