[Gpdd] [BEHAVIOR] Shaking/Purring? And What about those wheeks?

[Rebekah]

Hello everyone, this is Ethel and Lucy's slave again... we've just gotten 
them, and we've realized that every time we hold them, Lucy and Ethel 
shake.... Its like shivering but.... could it be they're purring?  What 
does it feel/sound like when the pigs purr?  And when we hold them, 
sometimes they start to wheek and squeak at us and each other.... does that 
mean they want to go back to their cage? are they scared or something?  can 
anyone explain this to me?

Lucy and Ethel are my first ever guinea pigs and I just want to know if I'm 
doing something wrong...

thanks lots!

Rebekah
Lucy
and Ethel