I have a six year old doxie. She has always ridden in the car with me from the time she was born. She has a soft carrier that she goes every where in. Just recently she has started panting heavily just as we get started like she is very hot but it is snowing outside. She is also shaking like she is cold at the same time. It will take her about thirty minutes before she settles down. If she is offered a drink she refuses. If you cover her she pants harder. She still wants to go with us. If we roll the window down because she likes to look out she then stops panting. Not sure what to make of this. Any idea!