Saddle slippage may be caused by any number of conditions, including saddle fit and rider position. But hind limb lameness may also contribute to saddle slippage. So lameness should be considered as a potential cause if a saddle consistently slips or rolls in a particular direction.
Kicks Out with a Hind Limb Under Saddle
Check your saddle fit and your horse's back, but also watch your horse move and assess for lameness at the walk and trot. Examine the limbs for swelling, digital pulse and heat. Share your findings and concerns with your vet.
In addition to assessing saddle fit, your vet may perform a lameness exam to rule out subtle lameness contributing to the problem.
How is the horse performing under saddle?