Why is my guinea pig making sounds, has red ears, and feels warm?

Thans for reaching out about your guinea pig. It sounds as if he has an upper respiratory (and possible lower respiratory) infection. A veterinary visit is recommended to provide a diagnosis and treatment plan. The sooner the better, especially with the bleeding from the nose. Good luck.

Thanks for reaching out about Chorizo and including photos. Common causes of dermatitis in guinea pigs are fungal infections (ringworm), mites and bacterial infections. This is likely ringworm, which is possible contagious to people. A veterinary visit is recommended to assess and provide a diagnostic/treatment plan. Good luck.

He may have a respiratory infection. This will need to be confirmed by your veterinarian after a physical exam. If necessary, the vet can dispense antibiotics. In the meantime, keep Carl warm and as stress free as possible. Keep the cage clean and limit dust and dander as much as possible.

I wouldn't say normal. There could be a few conditions happening. I would make sure his teeth are even and there isn't an uneven surface causing discomfort. Oral and respiratory infections can happen which could cause a sore throat which could change the voice. If there are Cedar or Pine shavings for a bedding this can sometimes cause allergies with Guinea Pigs. Also a diet lacking in Vitamin C could be the cause. Always make sure you have the correct husbandry or it's easy for problems to occur. I would recommend keeping a close eye on him and if he is acting abnormal (not eating, drinking, abnormal feces or urinating) then he should visit a local veterinarian. Guinea pigs are very fragile and can look normal one instant then sick in another. Here is a link for proper husbandry of guinea pigs. Https://www.aspca.org/pet-care/small-pet-care/guinea-pig-care

Your guinea pig may have an upper respiratory infection or a tooth abscess. You should take it to a veterinarian familiar with guinea pigs for a check up of his teeth (guinea pigs often have malocclusions and teeth that are too long). If there is an upper respiratory infection your cavy needs to be treated with injectable antibiotics. Guinea pigs cannot take antibiotics by mouth as it kills their intestinal flora and can indeed kill the guinea pig. Should the crusts go away and your guinea pig eats and drinks well and is happy, then this might have been caused by a draft and it will not need a vet visit.

Thanks for reaching out about Cheech. A veterinary visit is highly recommended, ASAP. Grunting noises could be pain or a respiratory infection. During the veterinary visit, examination of cheek teeth is recommended, as this is a common prevention of appetite. Good luck.

Thanks for reaching out about Rocky. The described noise is likely a respiratory infection and he is feeling poor enough to stop eating. He needs to see a veterinarian to aid in diagnosis and treatment of the problem. Antibiotics are probably needed at the minimum. As this sounds serious, the sooner the better chance for recovery. Good luck.