Hi there and thanks for your question.
Good news! Revolution is not toxic if ingested. Studies have shown that it would take a large amount of oral revolution to cause any problems.
It may taste yucky and cause a little bit of salivation, but there will be no harm.
I hope this information helps! If you have more questions regarding this problem, just hit reply. If I am online I will respond right away. Otherwise I will respond as soon as I come online again. Or, if my answer is sufficient, then please hit accept. Thanks!
The above is given for information only. Although I am a licensed veterinarian, I cannot legally prescribe medicines or diagnose your pet's condition without performing a physical exam. If you have concerns about your pet I would highly advise contacting your regular veterinarian.