Streptococcus pyogenes, the cause of "strep throat" in humans does not cause tonsillitis in dogs or cats. However, dogs and cats can acquire a transient infection with this bacterium when they are in contact with a human with strep throat. Although they do not get strep throat, they may harbor the bacterium and serve as a source of it for other human infections. As this is the case, it is suggested that dogs and cats be treated when family members have strep throat, especially if recurring infections occur in the household.
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Tonsillitis in Dogs ~ Pawprints and Purrs, Inc.