Hi everyone! I have read some of the threads on the site, but I need some additional help. I have a 1.5 year old Min Pin/Chihuahua mix. I adopted him from the SPCA in March of this year and have been able to work with him quite a bit. He was a very nervous little pup when I first got him, which is understandable. He knows his basic commands, good on a leash, etc. He is a sweetheart, loves to be petted, loves to show affection. The only problem is the crate. Generally he will run right in and he gets his treat, but I recently moved and I think the move has him a little nervous. I am not sure if this is a breed issue or maybe his passed shelter life or even possibly a combination. However, now when he knows I am leaving he will get underneath the futon in my bedroom and I cannot get him out. If I try to get him he will show his teeth and even bite. I don't think he is biting as hard as he could, but a bite is a bite in my book. I love this dog to pieces, but I cannot have a dog that bites. I want to fix this so badly. I want him calm and want him to understand I am not leaving him forever and that I love him. But why is this aggression coming out and what can I do to fix this problem. This is the only time he is aggressive. Can anyone provide me with any tips or insights? I love him to death and would do anything for him, but I cannot have him biting. I have another dog a yellow lab that is trained well. She is 5 years old and gets in and out of her crate just fine. I trained her myself as well and she has done well. What am I doing wrong?