Some common behaviour includes:
Popcorning: A happy or excited guinea pig will jump vertically into the air or gallop around.
Rumblestrutting: The body vibrates and the rear legs step up and down alternately. Male to female this is a mating dance, while both males and females perform this routine as a sign of dominance. This is often accompanied by some chasing and mounting.
Licking: Guinea pigs often lick our fingers as a sign of companionship by grooming us.
Purring: Just like a happy cat, the body vibrates from top to bottom when the guinea pig is stroked and cuddled.
Whistling: A loud high pitched whistle is designed to tell you that your guinea pig wants something (usually food!).
Teeth Chattering: An angry guinea pig will rapidly and loudly chatter their teeth as a warning. This is often seen between guinea pigs that don’t get along or guinea pigs demonstrating dominance over a coveted resource (such as the feed bowl). This is seen more commonly in males, however females may also chatter.