Cat and dog fleas are very similar
in appearance and both species can live on both cats and dogs.
Humans are mainly attacked by cat fleas. A cat or dog may have
a light infestation of fleas without the human inhabitants
knowing it, but if the pets are carrying large numbers of fleas,
then there is naturally a greater likelihood of humans being
bitten. A heavy infestation may occur if the cat or dog is
removed from the house, for then the insect has no alternative
but to feed off us. In such cases one may comfort oneself with
the fact that the cat and dog fleas cannot breed without their
principle hosts, and so eventually the infestation will die
out on its own. On the other hand, they can live for months
on a diet of human blood, so it needs an unusual amount of
patience to wait until the fleas die of old age.
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