The doors in this trailer are like 8 or more inches off the floor and I have Blaziken in one room and Michael and Triton in another tell I can get them fixed but they can squeeze under the door and get out how do I block the bottom of the doors?so they can't get out I don't want Michael or Triton to get out when Blaziken does since they ain't fixed yes they have a appointment to get fixed in a month vet had no sooner appointment and the other vets cost 120 or more for females i'm using soda boxed but the cats figured out how to move the boxes :/ would putting water bottles in the soda boxes be heavy enough or do I need to use something else?