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How do Taco's teeth look?
Has he ever been vet checked?
Does her belly seem harder than normal?
Did you notice any pieces of the blanket having been chewed on?
Thanks for the additional information. I really appreciate it.
Guinea pigs can stop eating because their teeth get over-grown...the fact that she's willing to drink from a syringe but won't/can't eat makes me think that's what is going on here.
If this were my little girl, I'd give my regular vet a call first thing in the morning (you don't need to rush to an expensive emergency vet tonight or anything) and have them take a peek at her. They'll likely need to use a tool to grind down her teeth a little bit, which will make it easier and less painful for her to eat.
After you get them ground down a little, you'll need to make sure you keep an eye on them so that she doesn't get to this point again.
I hope this helps.
You're very welcome!!