Which boots would you advise for eventing, to support and protect horse's knees? We recently found out that my mare has grown spurs on her knees.

There aren't options that necessarily support the knees specifically as they're meant to protect the tendons and coffin bones. But I believe PEI cross country boots offer great support and cooling for the leg. Don't know if this helps. Good luck
Equifits are shock absorbing so maybe that will help to take the pressure off of her knees but I have never seen Boots for knees
They’re aren’t any boots for knees, not to use when riding anyway.
Join the fun and sign up to connect with our 200,000 members!