However, because of the ferret's size, the presence of only one adult worm may be fatal. Heartworm is transmitted by the mosquito. Both indoor and outdoor ferrets can become infected. Heartworm infection in ferrets is usually not detected until cardiac failure occurs. Signs include difficulty breathing, fluid build-up in the abdomen, heart murmur, and loss of appetite.
Diagnosis is difficult.
X-rays of the chest may be of some help in diagnosis as well as blood testing for heartworm. Treatment is difficult. Prevention is the key. Dental abscesses are common. This parasite is found most frequently in immature animals and may cause severe diarrhea and dehydration.