[print-me] Fleas are one of the most common external parasites of dogs and cats worldwide. They are more than just a nuisance; heavy flea burdens can be deadly, especially in smaller, younger, or weaker animals. Fleas are also responsible for dermatitis caused by an allergic reaction to the presence of fleas and flea bites known as flea allergy dermatitis, or FAD, which has been reported to account for over 50% of all dermatological cases reported to veterinarians. Other conditions brought on by fleas include anemia from blood loss, feline infectious anemia (a life-threatening blood parasite carried by fleas), cat scratch
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