I've seen trainers charge a 10% fee (when claimed).......on the increased value, when they improved the value of the horse. ( Claimed at 7000...lost at 10,000......$ 3000 gain......$ 300 to trainer)
But if you re-invested all the money you got from the claim back into a new horse....I would not pay anything if he/she was your partner on the horse.......and buys back in with you.
Another consideration....
......how about the 2 horses you bought/claimed at ..say $ 10,000 that were dropped in class....and eventually claimed or sold at less than $ 10,000
Did the trainer kick you back 10% of what you lost on your investment ? That never happens.
Another one that comes to mind..You own the horse outright....Train
er says that you should stake this horse in several events "I think they will make money in these races"................A
n owner I knew said "OK with me..and since you also drive , besides training....I will pay 90% of the staking fee..you pay 10%

?
You know what the trainer answered ...don't you