Hello and thanks for researching this very important question!
Although 4-6 years is closer to the "average" time a Guinea Pig will live before developing complications from serious illnesses, we do have to take this kind of excessive drinking seriously at any age.
Guinea Pigs are susceptible to bladder infections, diabetes and kidney disease.
Bladder infections can be quickly taken care of with a course of antibiotic, but can cause other serious health complications if left unattended, so an examination at a veterinary office that knows how to work with this species is the best thing to do.Look for exotic mammal veterinary office here
If an evaluation for his bladder health does not reveal anything, there are a few other things to consider:
Some Guinea Pigs are sensitive to the chemicals in cedar and pine bedding. These sensitivities can cause a plethora of symptoms. Changing to a paper-based bedding can help.
Guinea Pigs are sensitive to the sugars in root vegetables and tree fruits. Switch to treats like asparagus and berries as replacements for carrot and things like apple and pears.
Sometimes diabetes and or kidney disease will develop in young animals. Treatments are not always effective or even possible for such tiny pets. In your place, if he begins to loose weight as well, I would consult with a veterinarian who is licensed to use Chinese Herbs in pets in the hopes of rebalancing his body organs gently and safely.Look for Chinese Medicine Vet by clicking here
I hope this turns out to be something that can be solved relatively quickly!
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