18 VETERINARY PARASITOLOGY 
ously described, may be used. The following is of great 
service in any animal in which the patches are localized 
and not of great extent : 
Kk Formalin (formaldehyde 40 per cent. 
sol.) .. MXXX. 
Glycerin in de na aco Bis . 
Aqua ad 3xij. 
M. Fiat lotio. 
Sig... To be applied once or twice daily. 
Mange in the Dog. 
The three varieties of mange which may occur in the 
dog are sarcoptic, symbiotic, and follicular mange. 
Sarcoptic Mange in the Dog.—This form of mange in 
dogs is due to the attacks of Sarcoptes squamiferus. It 
may affect any portion of the body, but usually appears 
on the head, especially the ears, the lower surface 
of the body, and along the back, near the root of 
the tail. 
The first sign is the appearance of red patches, usually 
small at first, which the dog constantly rubs. The skin 
on these patches is red and inflamed, and shows on 
careful examination small papules and sometimes 
vesicles, and the general appearance is not unlike that 
of eczema. The hair is shed, and the skin then becomes 
thickened and covered with a grey scurf, and in some 
cases shows wrinkling. The disease quickly spreads, 
and in a few weeks the whole body may be involved, 
and the dog becomes emaciated and anemic. Sarcoptic 
mange must be distinguished from follicular mange, from 
eczema, and from areas which have been bitten by fleas 
and scratched by the dog until they have become 
hairless and sore. 
Eczema starts more often along the middle line of the 
back, on the sides of the neck, and between the thighs. 
