Not eating and losing weight

[AmaTom]

Good evening:
My 3.5 year old guinea pig that I rescued from a local piggy rescue in January, started to lose weight, and within the last couple of days is just about not eating anything anymore. I'm syringe feeding him Critical Care and he even does not take much of this anymore either. Got him to eat a little bit of fresh grass and seen him nibbling a bit on hay. That's all though. A month ago he was 1521 gr., today 1262gr. with a weight loss of 110gr. within this past week. I live in the country and the vet that specializes with guinea pigs is not open until Monday and over an hours drive away. Chances that I get in is minimal. Nothing has changed in our live and they get veggies and fruits with vitamin C supplementings. Right now I keep him separated from his pal, however they can see/smell each other if they want to. Question: I read about "Poop soup" that I'd like to try on him. Did anyone have any positive outcomings on getting their gut going again? Any other suggestions how I could get his appetite stimulated? I'm so worried that I will lose him. Thanks for any input.

 

[Piggies&buns]

I’m sorry to hear this.
He needs to see a vet as soon as you can get him to one - that level of weight loss is considered urgent and he really needs to be seen on Monday. In the meantime you need to syringe feed a minimum of 60ml in a day, weigh him daily so you can monitor that he is getting enough.

Emergency and Crisis Care as well as Bridging Care until a Vet Appointment
All About Syringe Feeding and Medicating Guinea Pigs with Videos and Pictures

Please do not separate him from his friend. That is an added stress a poorly piggy does not need. Plus separating them can ruin their bond and mean they have to stay apart permanently. They should never be separated unless they have a fight or there is a genuine medical reason to do so (there is not currently a medical reason to separate them in your case).
Please do reunite them on neutral territory (don’t just put him back in the cage, reintroduction needs to be done properly on neutral territory).

Bonding and Interaction: Illustrated social behaviours and bonding dynamics

Poop soup is useful to help settle the gut. Whether it will be useful in this case we can’t know but there is no harm in trying.
You need to collect poops from his companion. The poops need to be ones he has just produced, and you need to soak them in water immediately. After soaking for 10 minutes, remove the poops from the water and discharge them. Carefully offer your poorly piggy some of the water from a syringe.

Probiotics Live Gut Microbiome Transfer ('Poo Soup'); Recovery Formula Foods And Vitamin C: Overview With Product Links and Transfer Recipe