Our 8mm Strong Rubber Tiles would work as stall flooring for miniature horses. The tiles do interlock tightly, so liquids would have a tough time getting in between them. The tiles can be sealed with our Rubber Floor Finish and Sealer, which will prevent liquids from getting in the pores of the floor. We do offer non-porous tiles that don't need to be sealed. These interlocking tiles are just as easy to install as our 8mm Strong Rubber Tiles and will keep liquids from going in between the tiles. Examples of these types of tiles are our Rubber Gym Tiles, 3/4" Diamond Top Horse Mats, 1/2" Button Top Stall Mats and our 3/4" Waffle Backed Animal Mats.