A word of caution for some breeds: https://www.akc.org/expert-advice/health/heartworm-medication-side-effects/
With that said, this includes dosage information and might be of help. Good luck! https://www.onevet.ai/ivermectin-for-dogs/#can-i-give-my-dog-ivermectin
Thank you so much for your reply.
Now I am skeptical about giving it to him.
He is not a herding dog, just a mixed cockapoo type.