I would walk away. As a first time horse-owner, there are enough challenges with horse ownership than to purchase one with a previous history of founder and currently on meds. The thyroid condition/medication would concern me the most. Look at more horses.
When buying my horses, my husband video taped and visited with the seller as I test rode the horse. Very interesting to listen to those taped conversations that I didn't get to hear first hand as I was riding.
Be sure to get a pre-purchase exam. It's a buyers market. There are some very nice horses for sale at reasonable prices.
You might also consider leasing a horse. You'll have the responsibilities of horse ownership for a shorter term. If the responsibilities are more than you can manage, you could walk away. Buying the horse is the least expensive part of horse ownership.
When buying my horses, my husband video taped and visited with the seller as I test rode the horse. Very interesting to listen to those taped conversations that I didn't get to hear first hand as I was riding.
Be sure to get a pre-purchase exam. It's a buyers market. There are some very nice horses for sale at reasonable prices.
You might also consider leasing a horse. You'll have the responsibilities of horse ownership for a shorter term. If the responsibilities are more than you can manage, you could walk away. Buying the horse is the least expensive part of horse ownership.

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