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SESK: Stuff Everyone Should Know · sesk.info/dog-flea-allergy

Many dogs are allergic to what part of a flea bite?

Flea saliva.

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  1. Flea saliva ✔
  2. Flea eggs
  3. Flea cocoons

Why: Many dogs and cats are allergic to flea saliva, which can cause intense itching. Chronic cases can lead to hair loss and thickened skin.

Huh, didn't know that: Merck says even dogs that are not allergic scratch from the irritation of flea bites.

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References

Answer: Flea saliva. Many dogs and cats are allergic to flea saliva, which can cause intense itching. Chronic cases can lead to hair loss and thickened skin.

  1. Merck Veterinary Manual, Fleas of Dogs www.merckvetmanual.com/dog-owners/skin-disorders-of-dogs/fleas-of-dogs
    Many dogs and cats are allergic to flea saliva.
    Checked 2026-10-10.

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