Hi
I am very sorry.
Please step in with feeding and watering support with any lethargic piggy and switch to weighing daily on your kitchen scales first thing in the morning.
Weight and Weight Loss Explained: BMI, Weighing, Poos and Feeding Support
All About Syringe Feeding and Medicating Guinea Pigs with Videos and Pictures
If you do not have Critical Care or any other recovery formula brand at hand, here are tips on how you can bridge the gap:
How to Improvise Feeding Support in an Emergency
Please also step in with probiotics and - if your piggy has a healthy companion - with poo soup, i.e. healthy live gut microbiome transfer, which is more effective when done properly.
The baytril (active ingredient enrofloxacin) is low dosed, so hopefully there will be just some softened poos but no loss of appetite.
Probiotics & Live Gut Microbiome Transfer ('Poo Soup'); Recovery Formula Foods And Vitamin C: Overview With Product Links and Transfer Recipe
Has your vet checked for any fluid build up in the chest or body as well?
Wishing you and your poorly one all the best.