I'm trying to introduce a new 4-month-old girl kitten to a 9-month-old boy kitten. I purchased a 44" high pet gate that broke as soon as I tried to set it up. The good news is that the company I purchased it from gave me a full refund. The bad news is that I am now gateless or barrierless. I would like to know some recommendations for either a screen door or a pet gate I can put in the doorway to block off the two little ones from getting too close too soon. Any help, or advice anyone can give me will be greatly appreciated! Thanks in advance!