Teeth grinding?

[DarkStar]

When I am holding my pig and it grinds its teeth does it mean it is unhappy with me?

 

[Wiebke]

Yes, it doesn't like what you're doing and is challenging you over it. Boys do that more often than girls.

 

[DarkStar]

Mocha does this more than Moo. Besides stuffing them with food what else do guinea pigs like? I think moo likes being patted but when I pat mocha sometimes she does the grinding thing.