QUESTION:
When my ferret is asleep, I can HEAR him breathing (kind of a wheezy whistle). Also, he seems to "wheeze" while running around playing. Can ferrets have asthma? If so, is there anything to help them?

ANSWER:
Yes, it is possible for ferrets to asthma and allergies. What kind of litter are you using as sometimes pine/cedar chips can cause respiratory problems? Also breathing difficulties could indicate an infection/tumor in the lung and HEART problems.

You need to have an X-ray and a good check-up done by a ferret knowledgeable vet ASAP.