I was going to wonder what made you think of laminitis and suggest an abscess as a possibility too.
If you don't know about laminitis, it would be a good move to educate yourself about this, as it's such a common problem & if only people were proactive about it & recognised the 'early warning' signs, I believe most of the major 'founders' could be avoided. Likewise to a large degree with diet & nutrition - such important factors in overall health. Articles of Interest Home
& Katy Watts | Safergrass.org
are 3 among many good sites to get you started.
SafeChoice Perform Horse Feed by Nutrena
, she gets a tad over 3 lbs a day, I switched because she needs to gain weight and this has a high fat content but should I switch her to something else?
She also gets 1 lb alfalfa pellets and 2 lbs beet pulp (morning beet pulp, alfalfa with dinner) on top of their local cut hay.
Yeah, 'Safe Choice' is... not really.
It's lower than many feeds in NSC but that's only like saying Macca's is healthier than... If you're going to feed this or anything else grainy/starchy, or oil or such, which is difficult for horses to digest, it's vital to feed in small, frequent meals, rather than only 1-2 large meals daily. It's best to feed anything like this, so I'd also divide the beet & alfalfa into equal feeds over more meals if possible too.
Not sure about that amount of alfalfa & beet pulp for a clydie & it also depends on how much weight she may need, but you could possibly feed more of these. You don't want her gaining weight too quickly & it's also important to realise at 6yo she may be still going through 'gangly' stages, being immature.
Grain isn't generally the best thing for putting weight on a horse and if she gets free choice hay as well as the alfalfa & beet pulp(which are both high energy, good for conditioning), I'd be inclined to think there was something else wrong if she wasn't doing well. I'm guessing at her age she's in little work? Of course teeth & effective worming is important, but it could be that the starchy feed, or otherwise infrequent large, rich meals has caused gut issues. She may have an ulcer or such. It could also be nutritional imbalance that has caused her failure to thrive - a good nutritional supp that will balance her particular diet is valuable.
What should I feed for a horse that needs more fat but might have laminitis?
You can add fat directly as oil or such, but horses don't have the enzymes naturally to digest it, so you need to build up very gradually over a week or 2, not feed much (perhaps up to a cup per day) & feed it little & often. But you don't have to feed fat to produce it. Feeds such as beet pulp, alfalfa, rice bran, etc, are high energy/calorie without being high in starch/sugar & if input is greater than output, it converts to fat.