The Peter Gurney Guinea Pig Health Guide
I always use Tubigrip support bandage which is available from most chemists. Use the large size, designed for the human knee. You simply cut off about six to eight inches, depending on the size of the guinea pig, cut a couple of holes for the front legs to go through, about an inch and a half along the bandage. Expand the bandage with your fingers, slip it over the head and down onto the body, manoeuvring the feet out through the holes.
Be warned, for the first five minutes the patient shakes itself alarmingly as it desperately tries to shake bandage off. However, I have never lost a guinea pig through any kind of cardiac arrest, brought on by the initial stress of using this method.
The bandage usually has to remain in place for about two weeks. When I remove it, I massage in Calendula oil, for the skin is usually very dry and flaky, which I shampoo off the following day.
These techniques are only effective of course, where the itching is around the shoulders and down most of the trunk of the patient, but as ninety nine point nine of the serious itching problems are in this region they usually do the trick.