Hello, thanks for your question today! I am Dr. Drew, and I am a licensed veterinarian. I'll be happy to help you in any way I can.
I assume you are referring to the drug "piriton"
which is considered safe to use in dogs.
A 40kg dog would receive 4mg every 12-24 hours, as needed.
Apologies for the spelling but yes it was piriton. Anyway, you have answered my question and I thank you.