When I brought in the cat carriers I lent a friend, Archie saw them & I'm sure was reminded about vet trips (he HATES his carier & the vet). He took off like a shot, and when he reappeared he began growling every time he encountered one of the 3 females (with whom he has lived peacefully for over a year). If one gets too close to him, he swats her, claws bared. He apparently thinks that they are new cats who have just arrived. Right now I have him isolated in a room by himself. Any suggestions??