Why does my guinea pig not like being scracht on her back?

if your guinea pig is new to your family, then maybe she is just a little bit wary of you. You need to give your piggie time to settle in. If your guinea pig has been with you for a while, and doesnt normally mind being scratched anywhere else, then there are two posibilities:

1. that just might be a place she doesnt like being scartched

or

2.she/he may feel uncomfertable with you scratching her there. Check to see if your piggie looks like she is in pain, if so, get her checked out by a vet.

i hope this has been a help ^^