OK here comes my two penny worth! (will probably get myself in a real muddle, so pick out the bits you can understand.
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I agree with the others with regard to not doing anything much to alter Suzie's food at this stage. I can also understand Diane's preference for keeping her girl's diets under control, which I dont disagree with and what works for her and her minis is obviously good for them.
I wish my girls were not so fat, but with my set up it is not as easy to control them as I would like - they may be running 25 acres at the moment, but if you could see the nearly bald grass they are nibbling at, you would not believe how they could keep the weight on. LOL!!
BUT there is weight and there is weight! Out of all my 40 odd in that herd, I will say that there are just two or three that I would say are HEAVY with extra weight. The rest are fat, yes, but it seems to be what I would call a 'fit' type of fat - no loose or saggy bits, no cresty necks, no saggy bellies, just 'firm' flesh. Even the older empty mares and those I'm hoping are in foal dont have 'saggy' bellies, and no-one has loose flesh that you can poke with your finger and they are all capable of running flat out for 20 minutes or so of mad play time without much distressed breathing. Can you understand what I mean by weight or WEIGHT?
Went visiting today to collect the two mares and foals and two others that I though would be ready to move to the 'good' field. Moved the mares and foals (although didn't really feel they needed it, but felt that the two tubby little tykes might benefit from a little good grass of their own just in case their Mommas started to go down a bit on the 'starvation' acres. Went back with Cathy to inspect all the others plus the other two I had singled out and found that those two had actually put on weight again!!!!??? Where are they getting it from????
Cassie, I think Suzie looks great, but she has put on weight and it does look as though it is 'loose' weight. I would be very careful how you change things, but perhaps drop the chaff side of her food and if necessary up the breeda. You need to read the fat and starch levels on the breeda - neither are very good for minis unless they need to gain weight. How much Breeda do they suggest for a mini of her size and reasonable weight? If she is getting more or less the recommended amount then this should be enough for her together with her apples, carrots and sweet additives, plus her hay and the grass (dont forget that for the last month or so your grass will have gained in quality even if you dont have a lot of it, and this could have caused Suzie to pile on those few extra pounds). If you are bothered about her getting all her necessary minerals and vitamins then perhaps an additive or even one of those blocks/in a tub licks that are suitable for a mare and foal to have free access to.
Do give your vet a call to tell her of Suzie's 'episode' and find out what she thinks might have caused it, and what she suggests you do to avoid any future problems. But ignore her if she says to cut out Suzie's food coz she's getting too fat (just like you should ignore those neighbours and so called friends who are happy to spout their orders at you!!)
Like all the others here, this is all just my opinion. Also you are with Suzie, whereas we are only looking at pictures and the camera is very good at giving a false impression, so is not the best thing to use to judge what is actually happening 'in the flesh' so to speak.