Circular 338, U. S. Department of Agriculture 



Fig. 



the dog is transmissible to man and that due precautions should 

 according!}' be taken in handling mangy animals. The disease is 

 also transmissible to the horse. Mange is a debilitating disease, 

 leaving the patient more susceptible to various other diseases, and 

 mangy animals are poor subjects for treatments to 

 remove worms, being weakened to the point where 

 they are much more liable to giiccumb to the toxic 

 effects of such anthelmintics as chenopodium than 

 are animals without such complications as mange. 

 In connection with treatment, one must remem- 

 ber that the premises used by mangy dogs are 

 infected and that disinfection is therefore neces- 

 sary. So far as possible, litter of all sorts should 

 -Tiie feline ^^ bumed. Kennels and other constructions should 

 sarcoptic m a n g e be thoroughly cleaned and then disinfected with 



mite, iSiOtoedres . , , i j. t • ji j. j 



can. Female, hot, stroug coal-tar dismiectants. 



Dorsal view. En- 

 larged. From Ge- FELINE SAKCOPTIC MANGE 

 doelst, 1922, after 



meS^urcmlnif^. T\niile sarcoptic mange of the dog does not ap- 



long 'by"^i2o^to 125 P^^^" ^^ ^® trausmissiblc to the cat, sarcoptic mange 



wide: 'female, 245 of the Cat is transmissible to the clog, and this pos- 



to 175 wfd^e.r "^ "" sibility should be kept in mind where dogs and 



cats are associated. The feline sarcoptic mange 



mite, Notoedres cati^ is smaller than the canine form and can be 



distinguished from it on microscopic examination by reference to 



Figure 2. This form of mange is also communicable to man. In 



the dog this feline sarcoptic mange appears to be confined usually 



to the head. The treatment, in case of dogs, is 



identical with that for the more common canine 



sarcoptic mange. 



EAR MANGE 



Cause. — Ear mange is due to a mite, Otodectes 

 cynotis^ which is slightly larger than the canine 

 sarcoptic mite. Owing to their size and the fact 

 that they do not burrow, it is often possible to 

 see these mites with the naked eye (fig. 3), 

 either in the ear or in detritus removed from 

 the ear, the mites appearing as small white ob- 

 jects moving slowly about. 



Symptoms. — These mites puncture the tissues 

 forming the external canal of the ear and feed ^'^^otode^S' ci/«X. ""f^ 

 on the serum, causing an irritation which, 

 among other things, interferes with the normal 

 production and disposal of earwax. As a result 

 the ear canal may become filled with detritus, 

 consisting of more or less modified earwax 

 and inflammatory products in the form of scales 

 or powder. The mites appear to begin operations in the region of the 

 eardrum, but as they multiply the canal becomes more or less filled 

 with the mites, frass, wax, and scales. The mites alone cause a mild 

 irritation and a pronounced itching, but the itching causes the dog to 

 scratch and rub its ears and shake its head, and these activities on the 



male. Ventral view. 

 Enlarged. From Banks, 

 1915. (Micron meas- 

 urements : ISIale, 350 

 to 380 long by 250 to 

 2S0 wide; female, 340 

 to 5;!(> long by 210 to 

 350 wide.) 



