Why is my dog crying at night all of a sudden? she sits at my bed and shakes. then, she’ll get off and sit next to the door or scratch it or cry there. when i let her out, she goes and does the same thing at my mom’s door, or she will go to our living room and cry really loudly at our couch. this has been happening for the past few nights and keeps me up for a while. i just want to know if i should be worried, because we’ve had her for a few years now and she’s never acted this way.