Ok my mare stormy is 12 she was probablly a broodmare for idk half of her life. (i didnt own her then) but her back is always hurting her.. I was currying her one day and I noticed the closer I got to her spine she started flinching and backing up I ran my hand down her back and pressed and she jumped away from me. Well I just figured she was alittle sore maybe she popped it rolling whatever. A couple weeks after that I was tightening the girth and she tried to bite me luckily my friend was holding her head or she would have took a chunk out of my arm. And stormy just isnt a biter so I was like ok? She acted fine that day and she didnt act like she was in pain when I rode her so I just figured she wasnt in the mood for a ride and the whole biting thing was just her pmsing. But when my farrier came out I told him about it and he said her back was hurting her and he would check it. Well he ran his hand down her spine just like I did and she flipped out she jumped forward. It was obvious she was in pain. My farrier said he knew how to pop her back and he would teach me. ( I know and trust him he's the dad of a old friend) so I let him do it and when he did it she jumped forward again. & I heard her back pop. Afterward I ran my hand down her back and she didnt flinch she was in no pain at all. Jay ( my farrier) told me her back was sore bc she was getting up and age and years of being a broodmare puts stress on there backs & that I needed to pop it when she started flinching otherwwise she would buck and act a fool. I told him I would but im scared to do it and hurt her I don't wanna screw up her back more but she's always sore. Idk what I should do?