Hi Christine,

Thanks for your question.

Both of these medications are generally considered safe to give although as with all medications, there is the potential for side effects but in my experience these are very rare.

What are the side effects of Propalin for dogs?

So Propalin can cause restlessness, it can cause aggression, irritability, and even high blood pressure.

What are the side effects of Stilbestrol for dogs?

Stilbestrol has the potential to be toxic to the bone marrow.

Unfortunately my license prohibits me from recommending medications without having a client-patient relationship however I encourage you to speak with your veterinarian about which one might be best for your dog.

Good luck.

Dr. Alex Avery