This section is from the book "Everything About The Dogs", by Alvin George Eberhart. Also available from Amazon: Everything About Dogs.
Dogs are extremely liable to injuries of the tongue, which is not surprising when we consider the variety of articles they pick up - sharp pieces of bone or stone. In some instances the inflammation is due to a sting (I have known one or two cases of this in terriers, while the teeth sometimes cause lacerations.
The symptoms are first an increase of saliva, the jaws are moved constantly, and upon examination the tongue is found to be inflamed and tender, swallowing is performed with difficulty, thirst is present, or at least the animal finds relief in continually lapping, although probably not much is swallowed. The mouth should be rinsed out frequently throughout the day with a solution of boracic acid (1 scr. of the acid to 6 oz. of water). To do this, hold the head down slightly, pour the liquid in one side, and allow it to run out of the other. If a little is swallowed, it is of no consequence. A weak solution of Condy's Fluid can also be used in the same way with marked benefit. This treatment, with an aperient, is usually all that is necessary. If the inflammation is due to injuries caused by the teeth, the latter must have attention; they may require extraction. The food must consist for a time of warm milk or gravy. Chicken gravy or made from giblets, with flour added, is very nourishing, and many dogs that are sick will eat this when refusing everything else. Egg and milk to lap may also suit them, and it is good.
 
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