Will Benadryl help your dog sleep?

Benadryl (Diphenhydramine)

Is sold under different names, one is Benadryl, various Sleep Aids use Diphenhydramine in the exact same dosage as Benadryl.

The brand is not important, but only the active ingredient.

Diphenhydramine is safe for dogs, it is however used to treat Allergies.

So basic Benadryl is safe to give to your dog in the right dosage, but the problem is that the dog may not get drowsy from it at all. Diphenhydramine's primary function is as an antihistamine, the drowsiness is only a side-effect that humans experience. Some dogs get drowsy, some dogs don't. Your best bet is to try calling a local veterinarian and asking them what sedative will be both effective and safe for your dog.

It is perfectly humane to sedate an animal to prevent them from experiencing high stress levels or danger. Just make sure you get advise from a professional instead of strangers on the internet.