I have 2 almost 5 month old male kittens that I had neutered on Tuesday. The vet told me to keep them separated so I have and both of them have been incistently meowing ever since. It’s hard being a single working person to spend time with them separately. I tried introducing them back together yesterday however they were skiddish and didn’t seem to recognize each other. One of them puffed up and hissed at the other. Prior to the operation they were constantly together. Will they ever be able to be back to the bonded pair that they were and what’s the best way to reintroduce them back together?