Midges, sand flies, I get a bad allergic reaction from every bite - severe pain, swelling, red rash. Only thing that works is Claratyne or I guess any anti-hist. People use it "off-label" to give their sheep a bit of relief from bitten ears - don't know if it is suitable for canines. Worth trying at first bite and headshake unless you can find some learned advice against using it for dogs: for myself, Claratyne is a very quick life-saver when a cloud of midges turns up.