Thank you. Unfortunately, when a guinea pig stops eating, it is a medical emergency. It is called anorexia. If they go for 24 hours without eating, a condition called ketosis develops and the guinea pig cannot recover. When a guinea pig exhibits lethargy and appetite loss, something serious is wrong. You’ll need a vet to diagnose exactly what it is. The very best thing you can d o is find a vet who sees emergencies on weekends.
Until you can get to a vet, try to hand feed a variety of foods - a sprig of parsley, carrot, apple, a little piece of romaine lettuce. Be sure to leave timothy hay in the cage, too, in case he decides to try eating it. You can read more about anorexia at these two sites:http://www.guinealynx.com/anorexia.htmlhttp://www.oginet.com/Cavies/cvanorx.htm
If there is nothing that will entice your guinea pig to eat, you can feed him from a syringe. You must make sure that he is passing stools before doing this because if he has a blockage, it's dangerous to force food into her system. To be sure, you can place him in a box by himself on paper towels and watch for droppings. If he's defecating normally, you can make a slurry of crushed pellets, water, and pureed vegetables. This can be more difficult than it sounds, so I'm giving you a link to a page that describes it in great detail, including variations on what to feed, and how often to feed:http://www.guinealynx.com/handfeeding.html
It would also be good to give your guinea pig some electrolytes, even if he isn't passing droppings. Commercial products, such as Pedialyte an Dioralyte (made for human infants) are best, XXXXX XXXXX probably can't find them at night. I'll give you a recipe:
1/2 tsp. baking soda
1/2 tsp. table salt
1/2 tsp. potassium salt
3 tsp. sugar
Mix it all with 1 liter water.
The potassium salt is potassium chloride. It's sold in grocery stores as a salt substitute. It also is not likely to be available, so just make up the solution without it. Once you have the solution made, you'd mix it 1/2 solution and 1/2 water. Give it to Ceanas with a syringe placed in the side of his mouth. It will help with dehydration and hypoglycemia.
These measures may save your guinea pig's life in the short run, but they are first aid only, intended to keep up your guinea pig’s strength until you can get to a vet. If you have further questions about this, just let me know by clicking on REPLY. I hope you're able to entice your guinea pig to eat and get him some assistance quickly.