Some of the drugs used to treat fleas and ticks have the potential to cause seizures and muscle tremors in dogs. But the thing is, not every dog will have these reactions to the medicines. So, as a pet owner, you can take care of a few things to avoid harming your dogs. Firstly, don’t use any medication on your pets without a prescription from a veterinarian. Secondly, while your dog is on the medication, look out for the possible signs of uncoordinated muscle movements, like difficulty in walking or balancing. As these drugs are meant to affect the nervous system of insects, there is a small chance that they may affect your pets as well.