she ate dinner around 5 last night. Then around 9 we were playing with her and all of a sudden she started licking her lips uncontrolably. we thought maybe she had hair/dust in her throat so we gave her water and some kibble and she did fine with it. It went on for about an hour before she stopped. This morning she threw up bile- then ate and acted like her normal self. Bowl movements are normal. She was fine all day. Fed her dinner at 5 and around 5:45 she did the lip licking and burping for about 15 minutes and has now stopped and seems fine. When I feel her stomach she doesn't flinch, her tounge and gums look normal. Any suggestions? She's been on the same food for months ad is only outside on a leash when we walk her.