His back toe looks a bit swollen, could you get a closer/clear picture?
1 out of 5, 1 being the worst, how bad would you say the limp is, does the affected leg feel warm to the touch, could you check the bottom of his feet for Bumblefoot, does he appear healthy otherwise?
I'm going to soak the foot in Epsom salt solution and apply prid and Neosporin. Wrap it up and check on it tomorrow morning. He doesn't seem to be in too much pain, maybe 2 out of 5.