"The Foaming-Mouth Disease" is what the Wolves of the Beyond call rabies. This disease is highly contagious and can spread very quickly, supposedly faster than a wildfire. Faolan was once mistakenly thought to have it in Lone Wolf, and it was revealed that Old Cags, an old wolf who lived in the Pit, actually was infected with the foaming-mouth disease.
Signs and Symptoms
The symptoms are very easy to recognize. Animals infected with the foaming-mouth disease usually leave a splayed paw print, this is the main reason Faolan was mistaken for a diseased wolf in Lone Wolf. The infected animal will also have saliva in the form of foam around their mouth, and their eyeballs are way on the other side of their head. Their breath smells, and their tongue is yellow and the gums are green. Their eyes are also yellow and red. The infected animal will die very quickly because of this disease, and will want to spread it before dying. According to Toby, a bear will get extremely hot when infected with the disease.
There are no known cures at the time. This can be very bad because this disease is very easy to spread and could destroy the population in a very short time. However, there is a solution. As the Sark of the Slough says, it is to lure the infected animal into a wall of fire, where it will die burning and cannot reach contact with others.
Animals that have the foaming-mouth disease will have a slow, painful death, the saliva in their mouth would start to smell, their gums will become green, and they'll snarl and attack at everything they see. According to Toby, the bear cub who was kidnapped in Watch Wolf by the MacHeaths and thrown into The Pit, animals diseased with the foaming-mouth disease would get hot and their limbs would grow heavy.
In Lone Wolf, Faolan was thought to be infected with the foaming-mouth disease because of his splayed paw. The MacAngus clan, which discovers the paw print of the splayed paw, tell all the other clans. Later, the chieftains of the clans go to the Sark and tell her about the paw print and ask how to kill the animal. She says they must build a wall of fire, and lure the animal into it though the Sark is suspicious of the claim.
Later, Faolan is being chased down by a byrrgis and is lured into the fire. But amazingly, because Thunderheart taught him to leap on stand on his hind legs, he jumps for the sun and survives, what wolves say disturbed the order. The Sark is angry at herself for not asking for more evidence that Faolan was sick and is angry at the other wolves, calling them "idiots."
In Shadow Wolf when Faolan goes to the packs of the MacDuncan clan to carve a bone of forgiveness after disrupting the byrrgis he meets the Whistler and they hunt together after the Whistler tells Faolan he only eats hares. During their hunt/walk the Whistler tells Faolan that he was one of the wolves who had chased him in the byrrgis to kill him thinking he had the foaming-mouth disease.Old Cags has the disease. No one knows how he was able to survive the disease. The MacHeaths worship him like a god, a god who must live separate in his "stony heaven", and take rebellious pups to him. His strengths and weakness both are names; not knowing the pups' names confuses him, and the name he uses to moonblink the pups, turning them into his slaves. The pups would sometimes try to fight Old Cags or would just simply give up on life and run right to him and he would bite them, giving them the foaming-mouth disease. Old Cags is also "jealous" of the death of the pups since their lives ended and he had to continue to suffer.
- Old Cags
- An unknown wolf; killed by Gyllbane shortly after Coryn retrieved the Ember of Hoole (Guardians of Ga'Hoole)
- Uglamore; bitten by the Unknown wolf (Guardians of Ga'Hoole)