Changes in barometric pressure can bring on colic in some horses. Most colic cases are simply due to not drinking enough water.

And BTW, pooping NEVER means they are better. After 22 colic surgeries and working for a vet for a number of years, you learn these things. 3 years ago my stallion colicked. He never rolled, just stood in the corner sweating. He pooped a total of 8 times before I got him to OSU. He had a serious case of gas colic. Horses do not have to roll to simply displace something. He had displaced his ceacum to his upper right dorsal line. He was fine after surgery.

Always keep banamine on hand. Banamine does not do enough to mask symptoms for a vet. If it is given with a little sedative, then yes.

There are also a lot of vets that like to pump the oil to them. I am not against this, but in a few cases I have seen that went to surgery, it can cause the ceacum to rupture. Not pretty.
Nasogastric intuation with water and electrolytes is just as effective, even with impactions.

If you are really far out, it would be a good idea to learn to palpate your own horses. This way, if you have an impaction, you can remove some of the feces and get a better idea of what is going on inside the horse. It's not hard to learn and very handy when those pesky vets won't come out.

Alas, monitor his water intake. It would not be a bad idea to give him daily electrolytes. Also, since he is older, consider wetting his hay. It makes it a little more palatable and easier for some horses to digest. If he seems fine now, offer hay, but withhold feed for at least 12 hours. If he is normal the following day, offer half of his normal ration of hay and grain then slowly build him back to his normal feedings.

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