When it comes to flea and tick medications for dogs, it’s essential to be aware of potential side effects, though many products are generally safe when used according to directions. The most common side effects include temporary irritation at the application site, such as redness or itching. For oral medications, dogs might experience gastrointestinal issues like vomiting or diarrhea. Lethargy or a slight decrease in activity can also occur. In rare cases, neurological effects such as seizures have been reported. It’s crucial to consult a veterinarian before starting any new medication and immediately report any adverse effects observed. They’ll be able to provide guidance, possibly adjusting the treatment or offering alternatives.