So sorry to hear that your babies have been diagnosed with this. My hot rod went thru lp surgery, thankfully all is well now. Maggie may was diagnosed with lp, low grade 2 which totally surprised us as she's never shown any signs or any pain from it, she is almost 3.
I give Dasuquin supplements. I had a time giving them the pills which I crushed in their food which they wouldn't eat.
I tried cheese, luncheon meats, you name it. I just got soft Dasuquin chew and they seem to like. They think its a treat. Lol. dasuquin is like cosequin plus.
As for prevention, you may want to invest in stairs or ramps. You want to try and restrict the jumping motion as possible. I know, easier said than done but this will help any impact pressures on the joints that may make them go out of the sockets.
Best of luck to you with this. They may never have any issues but prevention is definitely a good thing.