I was at the pet store about to buy rescue remedy when the store clerk suggested another brand. She told me she's used rescue remedy and it worked with her large malumut scaredy-dog, but that over time it seemed to wear off. She recommended this product instead: www.homeopet.com/ (the anxiety one) and it works! It has measurements (drops per weight of dog), but I just squeeze for a second into my dog's mouth - sneaking it in the side of her mouth. It's just easier that way. I've also put it in her water.

My dog used to have terrible car anxiety where she'd foam at the mouth and overheat, panting heavily - it was crazy! I used these drops and she just kind of looks at me like "huh?" then goes to sleep. When we got our new dog I put a big dose in their water bowl - not sure if it helped, but they seemed to calm down, but that could have been just from exhaustion from playing so much!

Rescue Remedy is a great situational remedy for stress and trauma, but there are others that are better for fear, especially if you want to really solve the problem rather than just help ease the stress when it happens. I use the brand Healing Herbs, which names their's "Five Flower Formula" (same as Rescue Remedy, which is a trademarked name)

Flower Essence Services makes a ready-made formula called "Fear-Less" that is good. There is also a "Anxiety/Fear" mix from Pet Essences. You can find these easily online with a search. Look for essence mixtures that contain at least Aspen and Mimulus, as these are core essences for fear.

When you're in the midst of the situation you can use a few drops as often as every couple of minutes, and can apply it topically as well as in the mouth. My dog doesn't care for the undiluted remedy straight from the bottle unless she's stressed, then she licks it off my hand.

If you're using one of the fear formulas you'll want to have the dog consume it several times a day for perhaps a month (not that it won't work in the moment, but you're trying to solve the problem long term so the continuous energetic nudging gets the system shifted more firmly). It works just as well diluted, so put a few drops in the drinking water daily, and add diluted remedy to their food, in addition to a direct dose once or twice a day. I have a PDF on my website that explains using flower essences if you're interested:
theartofdog.com/articles.html

The HomeoPet "Anxiety TFLN" is especially for noise fear (Thunder, Fireworks, Loud Noises). It's a homeopathic, which is a bit different than a flower essence remedy. You can use them at the same time if you like.

Rescue Remedy / Five Flower Formula is something I think everyone should have on hand for emergencies!

Cheers,
Margarat