Food and Water
Vitamin C - Guinea Pigs are like humans they need vitamin C. You can get some brands of Guinea Pig food that have it added however this should not be considered a reasonable substitute for feeding your Guinea Pig fresh food. I will cover feeding your Cavy in more depth on the page Feeding
If your Guinea Pig is not eating or drinking this is very serious. You must take them to a vet immediately.
Eyes, Nose and Ears
Checking your Guinea Pigs eyes, nose and ears daily will alert you to any infections they may have picked up. They should always be clean and clear. Eyes should look bright and open fully. Ears should be warm to the touch. If your Guinea Pig has any sores or any signs of an infection you must take the Cavy to the vet. A Guinea Pigs natural defence it to hide illness. A Guinea Pig can be close to dying by the time you may notice. Always act quickly if you feel concerned. A vet would like to see you 5 times to say "your Guinea Pig is fine" rather than see him once when it's too late because you hadn't noticed.
Guinea Pigs nails need regular trimming so they do not grow excessively. I would write a piece about it here. However a web site I have used in the past to find information when I was new to caring for cavies has a really clear concise diagram. How to cut a Guinea Pigs Nails
Guinea Pigs must have hay to grind their teeth down with. There must always been fresh unsoiled hay for them to eat. A hay rack is perfect for the purpose of keeping the hay off the bottom of the pen.
Signs that your Guinea Pigs teeth may be over grown are they may have salvia around their mouth, or it could possibly show by a lack of interest in food. It would be painful to eat if the teeth are over grown.
I have read many different views on how often you should bath a Guinea Pig. I just bath them when I think they are getting smelly. I have bathed Kornage 3 times in nearly a year of owning him. The first time was to clear his fur of mites that he had picked up from the pet store I had brought him from. The second time was when I introduced Nutmeg to him and Millie because Millie was not accepting her. I bathed all 3 piggie's and it made no difference at all!
If you have a long haired Guinea Pig you are
going to have to groom them daily. Also in the summer you
may wish to cut their fur for them.