A positive blood test from a dog usually means that it has eaten a bubonic plague-infected rodent. Dogs can also become infected through being bitten by a flea carrying the plague bacteria.
Bubonic Plague Pictures: Dog Blood Test
Photos of Bubonic Plague Infections and Transmission
From Mary Kugler, R.N., former About.com Guide
Updated February 13, 2009
About.com Health's Disease and Condition content is reviewed by our Medical Review Board
Taking a blood sample from a dog to test for bubonic plague infection
Photo courtesy of the CDCMore About Bubonic Plague
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