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Flea saliva that’s injected into the dog when they’re bitten could cause an allergic reaction called flea allergy dermatitis.

The human flea is actually rare in Central Europe. However, in Berlin, the parasites are currently spreading—likely due to foxes. PETBOOK editor and biologist Saskia Schneider explains how fleas ...

When you buy through links on our articles, Future and its syndication partners may earn a commission. Credit: Getty Images What kills dog fleas instantly? This is one of the questions I’m asked most ...