Hi. This is my first dog, so I don't know if this is normal. My dog is 15 months, we've had her for approximately 3 months now. I'm a stay-at-home mom, so throughout the weekdays my yorkie has the privelege to be and about our house all the time, and she's so loving with everyone in our family. But, on weekends when our family run errands or go out we put our yorkie in her crate for 3 or 4 hrs. Note: she's crate trained so even when she is out during the weekdays she will go in her crate to sleep or just to get a break from the family for 3-4 hrs. So, when we crate her on the weekends I've noticed that when we come back and open her crate, she will growl at us, or be shaking scared, or prep herself in an attack/pouncing position. We leave her with her kong, and arrive with treats therefore I would expect her to be happy to see us. I just don't know why she reacts like this. Has anybody experienced this? Is 3 hrs. In the crate too long?