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Why can I feel my guinea pig's ribs and spine, but he's not losing weight?

Updated On September 23rd, 2025

My Guinea pig Mickey doesn't seem to be loosing weight but it seems I can feel his hip bones/spine and ribs he doesn't seem to be bloated he is constantly eating and pooping/peeking but seems he has no fat where these bones are. He gets unlimited oxbow Timothy hay 1/8 cup of oxbow Essentials daily 1 cup veggies/grass/flowers 1 oxbow vitamin C tab daily Don't have money for a vet right now just wondering if anyone can give me a in depth answer -thanks

1 Answer

Most Helpful Answer

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Answered By Rebeccah Wood

Licensed Veterinary Technician, Registered Laboratory Animal Technologist

Published on July 24th, 2017

Hello there! I'm sorry to hear that Mickey isn't looking well. I'm glad to hear that he is eating, drinking, urinating, and defecating normally, as changes in any of these habits can indicate a disease process. It sounds like he has a great, healthy diet of hay, pellets, and vitamin C tablets - my only suggestion here would be to make sure that the fresh fruits and veggies offered to him are high in vitamin C (such as kale, parsley, guava, broccoli, and sweet peppers), as the tablets are usually only meant to supplement the fresh portion of the diet. It does not sound like Mickey is lacking in vitamin C, however (as you didn't mention any of the typical signs of scurvy), and the muscle loss you are describing is likely not due to anything missing in his diet. Without knowing his other potential symptoms and a full physical exam, the only other thing I can think of is age-related changes (you did not mention his age, but as you seem to has a great grasp of his usual body condition and his daily routine, so I assume that he is at least an adult). As guinea pigs age, they may develop conditions like arthritis, which could result in decreased activity, and therefore decreased muscle mass. These changes usually occur in older guinea pigs (5-7 years), but can start as early as 3 years old, depending on the individual guinea pig's weight and habits. I highly recommend that you get Mickey to the vet when you can - preferably a vet that is comfortable with guinea pigs, or an exotics specialist. It sounds like you are doing right by Mickey at home, but the only way to get to the bottom of his muscle loss is through a thorough veterinary exam. The vet will weigh him, listen to his heart and lungs, and make recommendations for other potential issues that can be checked and ruled out as causes. This may include x-rays or bloodwork. In the meantime, keeping Mickey active with mild to moderate exercise regularly can help keep those joints lubricated and prevent further muscle loss. If Mickey appears at all painful, or if any of his habits change, you should contact a vet as soon as possible. Good luck!

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