Not once dried, but definitely whilst wet! As an insecticide, it can result in respiratory or nerve damage when your dog is exposed to it, especially for longer periods - it could affect a number of their organs, having serious consequences.
Potential side effects of contact with a spectracide include vomiting, diarrhea, convulsions, blacking out and even falling into a coma. That goes for you and your furry friend, so it really isn’t worth it to mess around or take any risks.
Only once the spray has completely dried will it be safe to allow your dog to roam free on the lawn once more. The time this takes will depend on several factors - not to repeat ourselves, but you really ought to wait at least 24-48 hours.
It might feel dramatic, but this will make sure there are zero harmful traces around to harm your dog. Taking precautions is a whole lot easier than spending thousands on vet fees and coming to terms with the fact you made your own dog sick.
As soon as everything is fine, your pooch is free to walk around as normal - just be sure to wait long enough!