So my pony Rosie has always had a bit of spunk, but about 15 minutes ago, really became extremely aggressive. I went outside to check on her because she gets cold easy and it is cold and rainy today. She was shivering and walked right over to me and let me scratch her as normal. I put her halter on and brought her in her stall to towel dry, blanket and then release. Unexpectedly, when I went to towel dry her she turned her butt at me (I got out of the way) and kicked out. She has also tried biting me (not nibbling, but a full on aggressive bite). This horse does NOT act aggressively. I have been doing more work with her lately, but she is just not an aggressive horse. I gave her hay and left her in her stall and she is pawing, and making a nickering noise every time I leave her stall, but I have a puppy inside and I had to come back inside. I have her in her stall right now. Sometimes as she is eating she makes a grunting sound and whips her head up. I'm very concerned. Any suggestions? The shivering has stopped by the way.