I have 2 quarter horse mares one 16 the other is 22. I rescued them 2 years ago and other than discovering the older mare has heaves they have been healthy happy girls that flourished in my care. The younger mare will do just about anything for food, but this morning when I went out to feed and turn out I discovered neither mare finished last nights grain. Their hay is finished and each have clean water available. Neither is showing signs of pain of any kind, temps are regular, regular breathing, no abdomen distension, and I observed them both drink water this morning. They're acting a little off, but nothing severe or obvious to anyone but me. There has been no change in diet, exercise, or stress levels. I'm worried, but I'm also broke. Should I just keep an eye on them or go ahead and call the vet?