I would move him back to a bucket and sponge, and start steadily working him back up to the hose. Once he's good on the first, introduce the hose, let him sniff it, and if you turn it on, keep it before him, just spraying the ground. I wouldn't keep him in the cross ties, or so on when you're doing this if he's afraid of it, as it could bring him to feel trapped, and cause him to panic. I would try to determine what part of it is scaring him, whether it's the hose, the water, so on, and go from there.
My youngster has only got used to water recently and had her first bath. Here's what I did:
- Hover the hose around the horse switched off. If he moves away from it then you know it's the hose itself he is afraid of. Stay with him if he moves and keep the hose near him. Only take it away if he stands still.
- When he eventually becomes comfortable with the hose, turn on the water and allow him to investigate it. Don't put it on him, but again, if he moves away, stick with him. Reward him by moving away the water if he stands still.
- Begin showering his lower legs with the water. Again, if he moves away, keep the water on him until he stands. Once he stands, remove the water as a reward.
- Work your way up from his legs once he's comfortable with the water being there.
Going back to basics is the best thing you can do. Ensure he's not tied tightly so he doesn't feel trapped or threatened. Desensitising him from the hose itself can be done in an arena or roundpen if that's what he is afraid of.
Try a bucket and a sponge but also try de sensitising him to the horse again. Just walk him past it off and then point it at him while its off. After he is comfy with the horse, walk him past it when its on and when another horse is getting a bath. When you get back to hosing him, start on his leg and work your way up. It will take a while but it will be worth it
Thanks. Its the weirdest thing. He was perfectly fine with baths last year. He didnt have one for about 6 months because it was too cold and now hes like terrified. And nothing happened for him to be that way. Just really strange.
Try bucket and sponge and just work him up to it, put a chain on his nose just incase he pulls anything. Inforce positive behaviour with treats and be patient :)
Maybe try will puddles first. Like just walk him and let him explore a puddle of water or a tiny pool. Also I'm not an expert at all but maybe try wetting a sponge and trying to wash him with that and just talk to him and calm him.