Injured snail - need help urgently

Keep him in a small, shallow container so he can't climb too much (or hurt himself further by falling). Keep it very moist and spray the snail regularly to try and prevent him from drying out. Make sure that he has a good source of calcium available so that he can repair his shell if possible.
There are ways to attempt shell repairs, but it might be tricky on such a small snail. It may be better to just look after him and hope he can grow the shell back on his own.
Good luck!

I've seen small snails repair some crazy damage with help - the kind of thing you'd think they would never be able to survive. Unless the shell is completely crushed or completely comes off, they seem to have a good chance if they're kept moist and have lots of calcium to eat.
Hope he makes it

Make sure he gets as much calcium as possible, he might be nibbling his shell to reabsorb the calcium. Or as you say, just filing it down a bit. You could provide him with limestone flour, eggshells, cuttlefish, crushed oystershells or reptile-type calcium suppliment - if you only have cuttlefish, you could scrape some off to form a powder that might encourage him to eat more. Powder-type calcium can be sprinkled on food or the substrate or added to water, eggshells can be powdered too in a pestle and mortar but will not be water soluble I don't think. Obviously it is possible to overdo it and normally it's best to let them regulate their own calcium intake rather than lacing everything with calcium suppliment but for a short time, this little guy needs all the help he can get :)
Make sure he gets some nutritious food as well, since he has a lot of healing to do - a bit of fish food (flakes, damped into paste) might be a good boost for him or sweet potato, courgette, or some crushed seeds. Good luck!

I don't think anything antibacterial would be wise in these cases it's best to try not to stress them just provide food, if misting is making him retract maybe mist the surrounding areas so as not to stress him more - if he retracts deeply he could damage the shell more or start to push sections off. Don't move or touch him more than necessary as it could cause more damage he's best left alone now to repair (bar providing food and calcium obviously).

Also naturally he's unlikely to be doing much at this time they're more active early morning, late evening and at night. so not being very active currently is a good sign he's behaving as he should, and resting should do him good

Best of luck

Fingers crossed for your little guy !

that sounds brilliant! fingers crossed, it will still be very delicate that sealed over bit so be very careful with that bit

Hi how's the healing process getting on?

Hey guys. Thanks for your support.

I am very sad to say this little guy passed away We were so upset, we thought because he was intact (organ wise) that he had a great chance. But it seems it wasn't meant to be

We sent him (Hercules as we called him) to his final resting place in a river not far from us.

I hope he rests in peace and is enjoying vast amounts of his favourite food as we speak!

Thanks again for your help/advice and support.

Snailwhale

I'm sorry

Sorry he didn't make it. At least he was able to spend his last few days warm, comfortable and fed

I'm very sorry, it's lovely that you tried.

I'm so sorry he didn't make it. My first snail had a similarly crushed shell and didn't make it either, it was heartbreaking. You did a great job trying to help him, sometimes the damage is just too much though.