My horse cut his fetlock DEEP and is in a cast and on high dose of antibiotics. Now he is not eating hay almost at all and his poop is loose. He is eating his hay pellets, though and doesn't get upset when you press on the ulcer points. He is in good spirits. I am feeding him pro and prebiotics, Renew Gold, Timothy pellets, and mineral supplement. As soon as he cut his leg I put him on a gastric supplement, but I think he may have an ulcer anyway. But when I look up symptoms, it says the horse will eat hay but not grain. I went ahead and started him on Ulcergard. 

Sending good thoughts for your boy and for you, Miss Glenda

Aww, thank you! You are the sweetest person! 

You might try him on Forco.

Sore and being sick will knock a horse off its feed.  Wait until the injury heals to decide.

Honestly, I'd try him on some Zesterra.  When CC had the bladder infections and was on high doses of antiobiotcs she dropped a bunch of weight and was pickng at her feed.  Got her on the Zesterra and after about the 3rd day she started cleaning up her feed again.

Thank you! I forgot about that!

I would start giving him some alfalfa hay at least a flake in the am and pm. How is he doing today? 

I would love to give him alfalfa, but it effects him pretty badly. I went ahead and put him on ulcergard until THE gastro stuff comes in. It did the trick and he is going much better - eating better and poop is forming up. He is still on a big dose of antibiotics twice a day. Thank you for asking!

I would put a call into your vet and get their opinion. 

I did. He said ulcergard was ok to use with the antibiotics. I take him tomorrow for cast removal and to put the second one on so I will go over my plan with him. Kinda surprised he didn't mention to be on the lookout for digestion upset. 

I thought about your boy when the Platinum GI thread started. . . Hope you get s good report tomorrow

If it were me and I had an injured horse showing stomach issues I'd start him on NutraWound and then call Bob at T.H.E. and see if there was anything else he recommended.  

And if it were my cranky old mare who is a super picky eater anyways I'd offer her 2 or 3 different types of hay - because she is spoiled and knows I will go to great lengths to get her to eat.  

How did the recast go?   Hope you got good news and he's on the mend????

He doesn't have to have the second cast! Vet is thrilled with how he is healing. Still has to be in a stall for 10 more days at the least. I'll take him back then because I want to be sure. 
Here is what I did. 
the day he cut himself I couldn't get him to the vet so we slathered neosporin on the cut and the diaper I wrapped him with. Got him to the vet first thing the next morning. Vet was really doubtful about sutures but said he'd give it a try and he wanted to make sure the coffin bone was not involved. Thankfully, it wasn't. He did do a procedure where they used a tourniquet above the fetlock for up to 20 minutes and then take it off and he said something about the blood rushes down and floods the wound with antibiotics. I hope a vet reads this and clears up what I am sure I botched in this procedure. So the cast was put on a couple days later when it arrived at the vet's. The plan was to keep the cast on for a week, take it off to re-evaluate and put another on for 2 more weeks. But when I took him back yesterday the stitches were holding really well and he done a lot of healing. BUT his frog is soft and a little mushy. So he kept him over night to make sure the stitches held and to see how he did without the cast. He did super so the cast is off and I spray a DMSO/furacin(?) spray on several times a day. 
what did for his stomach upset was feed 30 grams of a pro/prebiotic before I gave his Antibiotics, then before the second dose I gave him 1/2 tube of ulcergard. I fed him Timothy pellets, Renew Gold, a mineral supplement and coastal and Timothy hay. Oh, and he got a handful of horse treats every time I had to give meds. And , I hesitate to say this because I hate being made fun of/called stupid BUT I did give him a Reiki session. 
Again, the vet is floored by how quickly he is healing and I am so happy. I think this tells me I am doing right nutritionally and my new vet is awesome.

I am waiting to receive the Gastro meds form THE. I am giving the Ulcergard until then. He is back to eating good again. Thanks for the suggestions. 

This made me so very happy!!!!

Thank you!!!

Great news!!!

Contact your vet ASAP- he is likely developing an antibiotic induced colitis which can be severe. 

His poop is back to normal now and he is eating well. He is off the antibiotics. Do you think I still need to call my vet? I called him before I started the ulcergard to let him know what was going on and if I could give the ulcergard while giving the antibiotics. He said yes and has seen him since then to take his cast off. He spent the night at the vets the, too. This was just this weekend. What signs should I loom for? 

Sorry I didn't read through all of that! If his manure is back to normal and he is eating normal you should be alright. Always need to be cautious with antibiotics

Thank you so much for replying! I actually never heard of that and I am really glad you brought it up. It's something we should all be aware of.