Patch Crest

What breed of Guinea pig is this?

I have a 9 month old female Guinea pig, but i don't know what breed she is; short haired, white with brown patches, but also has a white crest. I've searched for breeds, but none of them match. my theory is, she's a cross breed but i just don't know!
@piggy i live in the uk

Sounds like a crested English/American short-hair (depending which side of the Atlantic you are). Longer hair on the body would make her a coronet. If the brown patches are on her head and her rump, that patterning is called Dutch. Most pet guinea pigs are mixed breeds, but that is often a good thing as it means they don't have genetic problems that can be inherited from inbreeding.

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