I brought a horse home two weeks ago. She did not drink at first, but drank a lot after three days. She drank well for two days, but for 1.5 weeks she is only taking sips. I have partially compensated by giving her an alfalfa mash with lots of water mixed with a little grain. She is not constipated, and does urinate. I tried the dry alfalfa cubes, but she won't eat them. She constantly moves her tongue in and out of her mouth, looking like she has a dry mouth. I am waiting for the vet to come out later this week. She passed the pinch test. Any ideas?