The pine processionary caterpillar can kill your dog

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Your dog may pick up the hairs on its paws and lick them because of an irritation. This will bring the hairs into contact with the mouth and nose. The lips, tongue, and nose can swell up to a huge size until the whole head is swollen.

The tongue may become so large and swollen that partial or full amputation may be necessary. You might also notice a very bad smell. Because of the swelling the air passages can also become blocked leading to suffocation and death.