If it is an abscess, soaking in epsom salt does help bring it out. But I would, like Tinyliny said, use hoof testers to find out if its his hoof that's sore and where. If you don't have any, you should call the vet out. They can test the hoof for you and if they find the sensitive area they can usually locate the channel of the abscess and dig it out with a hoof shaver thing (I don't think that's the techinical term, but that's what they look like to me!!!). If they can dig it out and drain it, you will see improvement in Champ 100% sooner. Its pretty instant. Letting an abscess come out on its own is fine, but it takes longer and can sometimes get infected. At which point you would need an antibiotic from your vet anyway.