Vocalization while petting

[PigBusiness]

My guinea pig makes the following sound when I pet him:
http://soundcloud.com/pigbusiness/guinea-pig-petting-sound

Can you recognize this? Is he happy?

Thank you.

 

[BonBon2010]

Sounds content to me, my lot do it, Liquorice does it a lot, i'd say you've got off to a good start there

 

[Sarah from Chucklebunnies]

Definitely happy piggy. That's a heart warming sound.

 

[Twoflower]

My boys make the same sound, I'd say it's a happy sound.

 

[Victoria]

Polly does the same thing x as soon as she sits on my arm or on my chest and i stiroke or tickle her ears xx