Originally Posted by OntarioGreys
Products like advantage, advantix has the active ingredient imidacloprid and can effect the brain
Frontline has been noted to cause these head bobbing incidences fipronil
This happens in a small number of animals, it was because owners had kept diaries on their pets after the first instance they were able to trace back the cause
Article on spot on flea treatments
Does revolution have the same effect as I gave my dog this and the next day he started head bobbing but other times he's totaly fine.