My 4 month old gsd's leg began to bend due to slippey floor , what can i do now

he walks 3 hours daily , bephar kalk tablet as calcium source , No rough surface because i live in an appartment , How can i make the slippery floor grippy for my pup I love him alot and i Can't see him in this miserable Situation , It is completly my fault of putting him on tiled floor , I dont kow what should i Do now , Im soo stuck
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