Hi there I hope there is someone out there who has any ideas on what this might be. Our 3yo OTTB filly has terrible 'ripples' (I actually don't know what to call it) all over her back. She arrived here almost 4 weeks ago and had absolutely nothing wrong with her. Because of her age, we don't want to work her so she had only been getting 2 (maybe 3) days of work per week, just basic walk and a bit of trot and only for a maximum of 20mins. A little over a week ago, we had some terrible rain (it went on for more than 24 hours) and the next day her back was sore. We don't have stables at the moment so she was out grazing in the rain with our 11yo competition horse (also TB) all night. We immediately stopped working her but a few days later it had just gotten worse, ripples/bumps had suddenly formed and she was completely stiff in the hindquarters. The ripples had gone down 2 days ago and her back was almost fine again but that night, it rained...again...and then it rained the next day... The ripples were almost gone but yesterday they came back and had spread all the way up toward her withers. the back pain (and ripples) was never actually in the saddle region, it started by the croup area and by the next day it had stopped in the middle of her back but never got any further than that. On thing we know for sure is that this is not saddle related, her saddle fits perfectly and in any case, she has only been worked maybe 5-6 times since she arrived. We were using a wintec CC with a black (medium) gullet Her back is extremely sore, especially there where the bumps are. The bumps/ripples are not scabby or open, the hair is not falling out and she has not lost her appetite. She is also teething (one of her teeth actually fell out into my hand 4 days ago!) any ideas would be greatly appreciated!