Observing the degree of fluids, including subcutaneous and intraosseous fluids, can provide valuable insights into the health issue symptoms experienced by guinea pigs, along with monitoring their food intake, specifically the consumption of fresh veggies that are rich in nutrients. Dehydration in guinea pigs can cause weight loss, digestive issues, dental problems, and a decrease in energy levels. It is important to monitor their water intake and look out for these signs.