The FDA recently issued a warning about flea and tick medicines for dogs and cats potentially having adverse neurologic affects. If you've used Bravecto, Credelio, Nexgard and Simparica you might want to read this.

Speaking specifically about Bravecto, Credelio, Nexgard and Simparica, the FDA issued this statement:

So if you or your vet have used these medications on your pets, be on the lookout for any adverse reactions your pet may be showing signs of. And contact your vet ASAP if you think something is off.