i wet my horses grain down some so it is softer for her to chew and iv noticed she has started lifting her lip up right after she swalls it then she will stand thar for about 10 secads and so will do it agan. iv not changed her grain. and also when she gets down eating she makes a burping noise then her stomick makes some noise right after. dose anyone no whats makeing her do this? she is going to the vet wesnday but could anyone help me on whats wrong with her. and she is 16 years old if that helps