My horse has always been at a very healthy weight in the 4 years I've owned her. She has never signifigantly lost or gained weight, rather just has stayed the same. She never had ribs showing, although you could slightly feel them. She has always been a easy keeper aswell. But about a month ago I guess I noticed that I could visibly see her ribs when she moved a certain way. I thought that maybe she was eating less because it was getting extremely hot and she didnt need the extra heat, but a week or so later I seen she had lost more weight, for sure. Huh, weird, she has never lost weight any other summer. I thought she might have worms, but I wormed her only two months ago, and although I usually worm every three months I decided to worm her again, to see if that was the problem. Nope, two weeks later, still the same. I had to leave for two and a half weeks for work starting in the beginning of June, and she stayed at home in her pasture and my parents came out to feed her and check up on her twice a day. About one week into being out of town I got a call saying that when my mom had went out to feed her, she seemed dis interested, and when she stuck her mouth in the bucket she kind of just opened her mouth and grabbed some oats but spit it out, not chewing. Mom, getting worried, stayed out their watching her for a few minutes, and then she seen her lye down. Oh the joys, she was colicing. Mom got her up and started walking her until the vet came out, and he took care of Legend from their. It was a mild colic, but her first colic since I've had her. (Talk about stress, I've never wanted to be home so much in my life) I got home a week later and seen Legend was STILL skinny, her ribs as prominent as ever now. So, I had a vet out again to check for stomach ulcers, as those were my next thought of the weight loss, but nope, she was clear. Then I had him check her teeth, nope, good their too. Not to mention I had them floated in March. So last week Im cleaning her manure and I notice the over abundance of diarrhoea. Clearly something is going on in her body, and I don't know whether or not the sudden weight loss, colic, and runny manure (All happening within about 1-2 months) is all connected, but Im thinking yes? I've never had any health problems with her, EVER. And nothing has changed. Same food, same hay, same water, same fly sprays, riding time, same pasture, farrier, tack, etc. nothing has changed. So now I've been thinking, maybe she's just at a more normal weight now, and before she was on the chunky side, so if that is the case, why is she having runny manure now? And how do I get her to gain a few more pounds back? I am at a loss, I have no idea what to do. Im going to get some beet pulp tomorrow and and I've been looking at some smart pak weight gaining supplements, but ... what is going on with her? Or am I just over reacting?