Reddit mentions of ADAPTIL Calm Home Diffuser for Dogs (30 Day Starter Kit) 48 ml

Don't force her into the crate. That will only make the fear worse. If you need to leave, give lots and lots of high value treats, and a stuffed toy frozen with something high value.

Is she still scared of the crate if you move it to a different room? Sometimes this can sort of reset something for a dog.

I would make most of the good things in her life happen in the crate. Put her meals in the crate, put a Kong with yummy goodness in the crate. Leave the door open until she is willingly going in and not running right back out when given treats. Look into crate games, those are helpful too.

I would also recommend dtap collars, the adaptl ones are best. They also make a scent diffuser you can put next to the crate. these do take about 30 days to kick in. Other calming aids can also be helpful, I've had the best luck with rescue remedy. Some dogs also react very well to thunder vests. Once your dog is calmer in general you could potentially start working on desensitization to thunder/loud noises.

If you're American, expect tomorrow (and potentially tonight and the rest of the week depending on local fireworks laws) to be rough as well.

I'm in a similar boat (except I've got more advance notice) and have been finding the Digital Dog Training Textbook linked-to in the sidebar to be invaluable. Highly recommend. It's a little oddly laid out and it repeats itself itself but—as it says—you're really training yourself how to train the pup, so the reinforcement works (at least for me).

Their shopping list (oddly-formatted, watch out) includes:

• At least six chewtoys to stuff with kibble and treats (The Kong Company’s Kong and Biscuit Ball, Premier’s Squirrel Dude and Football, and sterilized long bones^† are the best.)
  
• Water bowl (Only buy your pup a food bowl once he is socialized, well-trained, and has impeccable household manners.)
  
• Dog food (dry kibble) During his first weeks at home, make sure your puppy receives all food stuffed in chewtoys, or handfed as rewards for socialization and training.
  
• Freeze-dried liver for men, strangers, and children to win your puppy's confidence and as rewards for housetraining
  
  (All links non-affiliate, just tryna be helpful :)
  
  Also, I saw this recommended somewhere. I have used a similar product for our cats and it's fucking magic, so if you're concerned your pup might be stressed, I highly recommend.
  
  ^† above, /u/caffeinatedlackey recommends against these until older

i also adopted 7 mo that lived with pig before. oh, he acted like a pig for a long time!! used to pee on the table and on the bed right at front of us.
to me it meant something is wrong, so with patience and time he became a great dog! didnt have an accident for a few mnths, learned how to ask to go out. i also have another dog for a 6 years, and when i got puppy a year ago, there was a lot of jealousy from an adult dog too. with respect to their feelings and time they are best friends and cant live without each other.
good luck and be patient! and whatever dogs do - they are reacting on our actions.
this also helps a lot. http://www.amazon.com/D-A-P-ComfortZone-Behavior-Modifier-Diffuser/dp/B000O5HUEA/ref=sr_1_1?ie=UTF8&qid=1331492698&sr=8-1

Feed him his meals inside the crate with the door open. Give him chew toys stuffed with the best treats imaginable, but only when he's in the crate. (Kongs stuffed with peanut butter are a popular choice.) Dog appeasement pheromones - DAP - can sometimes work to calm your dog down when he's crated. Rat terriers are very high-energy dogs, too, so you may benefit from really exhausting him with a long run before he goes in the crate.

Try these things before getting him a wire crate, because he may still chew on the wire and could break teeth.

A couple of people have recommended a pheromone collar or spray for my dog's anxiety. I haven't tried it yet, but I've considered it.

My dog used to have extreme storm/noise anxiety. We've worked through a lot of it, but there's still a good amount of anxiety there.

When he's home alone or I'm not home, if someone lets him out he jumps the fence. I've decided to crate him while I'm gone, so I think I'm going to try the pheromone spray and see if it helps at all.