Cats sometimes feel threatened, over–stimulated or nervous when someone new approaches them. To try and make your introduction go smoothly, always approach a cat slowly and politely.
Talk to the cat first. Cats are soothed by quiet gentle voices.
The signs of irritation to watch for include a hiss or long, drawn out meow, flattened ears, wide open eyes, and/or a twitching tail. Also watch out if the cat refuses to make eye contact, tightens or flattens his body, walks away or refuses to sniff your hand. If you notice any of these signals, stop and give the cat some space.