Just a quick question, how long has the previous owner had her and was she ever on the racetrack? If she was and he has not had her very long (as maybe his riding/training does not sound the best), please know that on the racetrack standardbreds are taught that the harder you pull on their mouth while they are trotting/pacing, the faster and harder they will run. They tend to keep this with them until you train it out of them, and a lot of people who get them end up with the horse running off on them when they are trying to stop.
I also agree that I see a typical standardbred body, long and typically lean. They want as long as stride as possible on them for racing. Toed in as you said and her knees are not set correctly. She does need to put on some weight, but you already said that too. You might also look into knee boots for her. If you haven't used them before they can be a bit tricky to fit and put on correctly. Usually knee boots can be found on websites/tack shops that deal in racehorses of any sort.
Getting a farrier to trim her correctly may help her feet out a bunch also. If he had her for a while it is possible he made it look worse by rasping and not knowing what he was doing.
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That was what I was wondering as well. I think he has had her about a year and a half, I know the people that owned her before that and they never rode her. My trainer also worked with her as a yearling. She was bred to be a pacer, her neck brand matches Ima Parkin Oops, Sire: Park Place Standardbred
, Grand Sire on Dam's side: Incredible Finale Standardbred
. She was bred to be a pacer but was never raced because her knees were underdeveloped. I actually have the opposite problem with her right now, any tug while moving, no matter how slight or if I'm bumping with my calves, slows her down rather than flexing at the poll. Working on it, but I'd rather have good brakes than a horse that grabs the bit and takes off. But that is an excellent thing to keep in mind when working with racing bred SBs.
I know she will be toed in anyway, but I know a lot of horses are toed in. I'm hoping it won't be as severe when her feet are fixed. They should grow out fairly quickly because the ground here is soft, but I have no patience! Lol. I want to be able to work on them now because she can't be comfortable with how uneven they are right now.
And he can sit a horse, but he always rides in spurs and likes to 'cowboy the sh*t out of them' as my trainer says.
ETA: I know nothing about Standardbred lines.