Hi my name is Liz and i have 2 guinea pigs named Annie and Violet. Annie is a 3 year old female and she has been tugging at my shirt and occasionally biting me to the point where it draws blood! Now i had a guinea named nala and she just duied and thats when i got violet but im thinking that annie is stressed out or something but if someone knows something about this it would be alot of help thanks!!