Give the penicillin (if you use that) into his breast muscle 1/4 inch deep, and alternate sides daily. Amoxicillin, clavamox, or others from a vet given orally may be easier.
For the other foot, you can try soaking the foot in warm Epsom salts once a day to bring the infection to a head.
For the other foot, you can try soaking the foot in warm Epsom salts once a day to bring the infection to a head.