This article is from the Fleas, Ticks, and Your Pet FAQ, by tittle@zmall.com (Cindy Tittle Moore) with numerous contributions by others.
They can carry various diseases including the protozoa Babesia canis
and the rickettsia Ehrlichia canis, both of which can cause serious
illness in dogs if untreated.
Also unlike most other ticks R. sanguineus can cause *in house*
infestations - that is, like fleas you can have full life cycles
occuring in the privacy of your very own home. In house infestations
of R. sanguineus in the northeast is apparently not that uncommon in
sone kennels.
 
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