I adopted an orange cat from a rest stop. Yesterday, I adopted another stray gray cat that used to hiss alot. My orange cat would usually growl at the new gray stray. But yesterday something happened. The gray cat was laying on my lap. After my orange cat walked underneath me, he had his back to the gray cat. The gray cat growled. The orange turned his head and hissed. The gray cat jumped off my lap and landed on my orange cat and they fought. I picked up the gray and put him outside. My question is: should I still try to bring the gray cat inside? Or should I give up making them house mates?