I contacted a trainer about Flora's anxiety with her crate (she would scream and howl for HOURS and have liquid poops all over her crate.) She gave me this paper, which I followed to the T. It took a LOT of time and patience, but it eventually worked. Flora learned to accept her crate (sorry it's so long!):
Desensitizing to the Crate
*The goal is to have your dog associate only positive things to the crate.
*Practice at least 10 times a day. The more, the better!
*If your dog is struggling with any step of the training, spend an extra day or two or more on the
previous step. Do not move to the next step until your dog shows a CER (“Yippee” response) to the step you are on.
*Note: If your dog already has a negative association to the crate from the past, the training may take a little longer. Be patient and positive with your dog.
Step 1: Toss a few treats in the crate once you notice the last treats are gone. Let your dog go get them as he feels comfortable (probably when you are not around).
Step 2: Toss a treat in crate (you will need really great treats such as hot dogs) – click right before your dog eats it, immediately click again and give another treat (while he’s still in crate and door is open). Click – treat – click – treat, etc. Reward frequently and rapidly.
Step3: Same as step 2 but gradually slow down the clicks and treats.
Step 4: Same as step 2 – but crate door is closed and click – treat through the door. The clicks are quick and the treats are continuous. Before your dog has a chance to get upset, open the door and let him out of the crate. Be sure to stop the treats when you let him out.
Step 5: Same as step 4 but gradually slow down the clicks and treats.
Step 6: Same as step 5 but even slower.
Step 7: Give your dog the Kong stuffed with really great treats. Close the door and stay in the same room. Be sure to return to crate to let him out before he is done with the Kong. Take the Kong away when you let him out. Before you know it, he will not want you to return. If he isn’t even interested in the Kong because he is so upset in the crate – you are moving too fast with the training, or find tastier filling for the toy.
Step 8: Same as step 7 but you leave and enter room frequently.
Step 9: Same as step 7 but you leave and enter room periodically.
Step 10: Same as step 7 but leave the room until you’re ready to let him out of crate. Still return BEFORE he is done with the Kong.
Step 11: Gradually increase the time he is in the crate – try adding 10 minutes at a time. You may need 2-3 Kongs to keep him busy while he is in there.
I must have worked on those steps for 2 weeks before I finally was able to leave Flora alone in her crate for over 30 minutes. It was so much work, but definitely worth the feeling of success and relief when I realized Flora wasn't freaking out in her crate anymore. I didn't do the last step - 2 or 3 kongs seemed like a LOT! - but I did save 3 special things solely for her crate, whether it was a bully stick, or a stuffed kong, or a marrow bone. She only got those items in her crate, never outside.
If your dog has SA, then I would really begin working on building up on the time you leave him alone. Rather than leaving him for 2 hours at a pop, start at something simple, like walking outside to get your mail, or taking a stroll around your house. Try ignoring your dog for 5 minutes before you leave, and 5 minutes after you come back into the house. Do you give him something to occupy himself with, like a stuffed kong or a marrow bone? Flora would get so upset in her crate she'd ignore those items, but with some dogs it seems to help.
Believe me, I know how you feel. I was crying all the time because I would constantly be cleaning up poop and it was so gross and so disappointing. It seemed like everyone's puppy/dog accepted the crate eventually, and NO one seemed to have the poop/diarrhea problem I did. It was really frustrating, but with a lot of effort on my part, Flora finally got used to being alone in her crate.
I hope you start feeling better soon. I know how frustrating this is, and my heart aches for you. It will get better if you work at making it better, I promise.