Disseminated Idiopathic Myositis (DIM) in Ferrets ('Polymyositis')

Vets have come across a new, vague and apparently terminal illness in ferrets.

First discovered in 2003, Disseminated Idiopathic Myositis (DIM) -- which is also known as 'Polymyositis' -- is an inflammation of the muscles (from the terms 'myositis' and 'polymyositis').

The other two terms which make up the name of the disease show that it is present throughout the body (disseminated) and the cause of the problem is not yet understood (idiopathic).

Both male and female ferrets are susceptible to this disease and while it seems to affect those aged 18 months and younger, there have been cases of ferrets aged over 2 years having this problem.

The symptoms are vague and non-specific and can include:-

Severe lethargy and weakness

Persistent fever which fluctuates and can reach 42C (108F)

Lack of appetite

Reluctance to move around

Diarrhea &/or abnormal poop

Mild nasal discharge which is clear (serous)

Dehydration

Poor condition

Some ferrets with DIM will have one or more enlarged lymph nodes or other swellings not associated with lymph tissue

If you suspect your ferret is suffering from DIM and you live in the States, go to the American Ferret Association's page on DIM to print out the DIM Case Report Form for Veterinarians as well as their DIM Alert pdf file.

For those of you who don't live in the States then just print out the DIM Alert and take it to your ferret knowledgeable vet for him to see if the problem is, in fact, DIM.

Disseminated Idiopathic Myositis (Polymyositis) in Ferrets by Holly Nash, DVM, MS

An Emerging Disease of Ferrets: Disseminated Idiopathic Myositis by Julia Whittington, DVM

An Emerging Ferret Disease: DIM by Katrina Ramsell PhD, DVM

Disseminated Idiopathic Myofasciitis in Ferrets by Simon Starkey BVSc, PhD, D.ABVP(Avian)

I recently lost one of my boys, Otis, to what I'm sure was DIM.

I've written about the symptoms and the very short period between the time I first noticed something wrong with Otis to when he finally left us here.

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