We just used frontline plus on our cat today for the first time. How long does it take for it to set in so we can pet her there in that area? Also, She is kinda down or sad and we don't know if it is from the product. Is there a side effect that we need to watch for? I just don't want to wake up and find that she died from this stuff.
It usually takes about 24 hrs for the frontline to work. I am sure your pet will be just fine. The most common side effect is irritation at the site of application. If the depression continues I recommend a visit to the vet.