EKAR-MITE OF THE DOG. 77 
be badly affected for a very long time, and yet no other 
sheep will catch the disease. The animals invaded by such 
mites, show their presence by stamping, scratching and bit- 
ing the affected parts. The remedies proposed elsewhere 
for the treatment of the common scab of the sheep can be 
used with good effect. 
THE EAR ITCH-MITE OF THE DOG. 
(Symbiotes auricularum var. canis). 
As early as 1834 Hering of Stuttgart discovered an 
ulcer in the ear of a dog caused by an itch-mite. Since that 
time it hasbeen found very often, and 
the parasite is by no means uncom- 
mon in Minnesota, where it affects all 
breeds of dogs, but especially hunting- 
dogs. Animalsinvaded by these para- 
sites are, in extreme cases, seized by 
convulsions, which are frequently mis- 
taken for epilepsy, or even for rabies. 
Dogs infested with such mites flap 
theirears very often and scratch them 
violently, showing the irritation pro- 
duced by the parasites. They also cry 
Bip oxis aitcofade: loudly from time to time, becomeangry, 
mndless Greatly enlarece-| foanr at the mouth, and run howling 
against obstacles, or turn several times in a circle and fall 
down asinafit. Such attacks are repeated and the animals 
become unfit for service andsometimes deaf. Ifthe auditory 
canal is investigated it is found to be lined with a dark 
and ill-smelling substance, in which are multitudes of the 
parasites of all ages and sexes. This substance is some- 
times so very abundant as to compress and push back the 
membrane of the tympanum. The mites (fig. 42) look like 
tiny white specks, oval in shape; they are very active, and 
if the ear is carefully watched they may be detected running 
aboutthe skin. This activity nodoubt greatly adds to their 
irritating presence. 

REMEDIES.—Wherever this parasite is found the kennels, 
