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thank you all for the reply and all good ideas and suggestions! I went though and checked most of them. His crate is for over 100 pounds, he seems can lay in there comfortablely. His bed is kind thin, I was originally thought maybe that caused him aching over after sleep long time on it, but after reading your reply, seems it should not be too thick. It is our dry season now, we don't have rains, lightenings or thunders. I only crate him at night, during the day, the door is always open. He has access to most areas in the house, even when we are not home, he still behaves very well. We never leave him alone at home for more than 4 hours. Everytime we come back, he's either laying on his bed in crate (with the door open), or on his pillow at one of his favorite spots. I always give him a little bit bedtime treats, a couple bite size cookies and one small piece freeze dried lever. Every night, when he saw me prepare his treat, put them in his favite Kong toy, he run to his crate, wait for me in there. even now, he still doing this. The differece now is, instead of finish treat, lie down, relax and fall asleep, he finish the treat, stand up, start barking).
One thing I want your opinions, can't remember since when, but so far, when we walk outside, when he tried to sniff the poles, bushes etc, if I don't let him, after a few tries, he start getting very unhappy, then start jump up, bite the leash, and also bite my hand. his mouth is soft, but teeth are pretty sharp, so I have some scratchs. I used to tell him NO BITE formly, didn't see much improvement. I asked his training teacher, and was told his behavor is not correct, and can't be ignored. so I followed the instruction, punished him 2 weeks ago, when he tried to bite again, I used my hands closed his mouth, held it, asked him sit and down, then told him NO BITE with a bad enough voice. He did behave better, still tried, but only a few times. Could be my punishment and bad