My dog is miserable and it doesn't seem to matter what we do we cannot rid him of fleas. He takes the Sentinel tabs for heartworms which are also supposed to kill fleas. We also use flea drops and he wears a flea collar and when we comb him nightly we get 8 to 10 fleas every night. Anyone else have this problem? I'm wondering if the fleas are resistant to the drugs and insecticides.
