For millions of dogs and people, the tiny flea is a relentless enemy. The flea is a small, brown, wingless insect that uses specialized mouth parts to pierce the skin and siphon blood. When a flea bites your dog, it injects a little amount of saliva into the skin to prevent blood coagulation. many animals can have fleas without showing suffering, but an unfortunate number of dogs become sensitized to this saliva. In particularly allergic animals, the bite of a single flea will cause severe it...
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