COMMON AILMENTS NOT INFECTIOUS 479 
and on the inside of the hock. Bog spavins result from 
sprains, bruises, or other injuries. When the injurics 
occur, too much joint oil is secreted, 
causing a bulging of the ligament. 
Lameness seldom accompanies a bog 
spavin. If lameness is present other 
structures are certain to be affected, 
pain and heat will be noticed, and the 
joint will be stiff. Treatment consists 
of applications of cold water, liniment 
or blister. 
| 8. Botflies.— Horses are often 
Boc Spavin noticed biting their legs in summer 
when the yellow nit is attached to the 
hair or other parts. The young larva, and even the eggs, 
are thus transferred into the mouth, and swallowed. 
When in the stomach they attach themselves, causing 
annoyance and often digestive 
disorders. Until they have 
completed their development 
bots are hard to dislodge. If 
a rag made wet with kerosene 
is actively rubbed over the 
horse where the nits are at- 
tached the eggs will be de- 
stroyed. Bots usually respond 
‘to medical treatment. 
The botfly of cattle is taken into 
into the mouth and partly develops re ae eam Aa 
in the digestive tract. It then bur- ai ame Ral oe nemale both: . in 
rows through the tissue until it ot; c, magnified head of bot. 
reaches the region of the back. 
The best treatm :nt is to destroy the 
grub as it develops under the skin. These are known as warbles. 
The presence of botflies among sheep is easily told by the be- 
havior of the sheep. This fly looks much like a house fly, and it 
Bots IN STOMACH 
