Travis,
We had one ferret who exhibited this symptom. The cause turned out to be a
greatly enlarged (but not malignant) spleen. The splenectomy was uneventful
and Small was robustly healthy for his remaining 6 years.
If your vet thinks the spleen might be causing the problem, you will want to
have the surgery done promptly. If the spleen ruptures, your ferret will
bleed to death.
Best of luck,
ellen & the Gang of Three
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[Posted in FML issue 2399]