I gave my horse a spoonful of this new supplement that's all powder. The first time ( two days ago ) I put it on a chopped up apple. At first she ate the apple and bobbed her head up and down but then she wouldn't eat it. I had to put some grain on the apple but even then she picked aside the apple and only ate the grain. This is coming from a horse who loves apples! So, the next day I mixed it in with her grain and when she got to it she was bobbing her head up and down. She then started to cough... Could this be because she may've inhaled the powder? I mean... it is powder. Is that probably why she was coughing? And why is she bobbing her head up and down? I mean, she obviously doesn't like it if she wouldn't eat it with the apples...