From Alfred Hitchcock Wiki

Hitchcock's cameo in The Birds (1963) occurs about 2 minutes into the film.

As Tippi Hedren walks into the pet store, Hitchcock walks out with his own two Sealyham Terriers (named Geoffrey and Stanley).

YouTube Video

http://www.youtube.com/watch?v=rZ8WT-BPTUI

Film Frames

Selection of film frames of Alfred Hitchcock in The Birds (1963) (click image to view larger version)...