You're speaking to Dr. Michael Salkin. Welcome to JustAnswer. I'm currently typing up my reply.
I'm sorry that your question wasn't answered in a timely manner. Considering the severity of Eric's fear/phobia, valerian probably isn't the best choice for him. Dosing recommendations are anecdotal and can end up agitating rather than sedating him. 10 mg/kg an hour prior to a stressful event has been recommended.
I recommend the new Sileo maufactured by Zoetis which should be available through Eric's vet. It contains a dissociative drug which you can read about here: https://www.zoetisus.com/products/dogs/sileo/
Please respond with further questions or concerns if you wish.
It will lightly "space him out" so he doesn't care about the noises. It calms without sedating my patient. Dogs remain normally functional. Please continue our conversation if you wish. I have to leave my computer for an hour but promise to reply as soon as I return if need be.
You're quite welcome. Thank you for your kind accept. I appreciate it. I can't set a follow-up in this venue so please return to our conversation - even after rating - with an update at your convenience. You can bookmark this page for ease of return.