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Fleas are tiny, so they live on furry mammals. They actually suck blood. It would hurt if they were bigger, but since they're so small, it makes a small tickle. This is what causes dogs to itch.
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∙ 13y agoThis answer is:
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∙ 16y agoFleas are external parasites, living by hematophagy off the blood of mammals and birds.
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Related questions
How do fleas eat?
Fleas eat blood from animals like Cats,dogs ect.
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