I'm going to be taking on a mare who has never seen much regular work and has been living off of grass for most of her life. She's 17h, 9 years old, and she is in really good health. I don't want to be feeding her lots of grains - she has never needed them and I don't want to introduce a massive change to her digestive system, especially since she needs to lose some weight

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leanspa
leanspa

Well if you can keep her on natural grass that will be ideal if not there are a handful of products on the market that you can feed her without affecting her diet.

I suggest Just Grass from Dodson & Horrell which is partial forage replacer and Fibergy also from Dodson & Horrell it can also be fed as a partial or total forage replacer.

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Horse nutritionist specialised in high quality horse feeds and feed related diseases like laminitis.