Clavamox is a prescription broad spectrum antibiotic for cats and dogs that treats a variety of infections caused by bacteria. Clavamox is specially designed so the bacteria cannot build a resistance to it and it is used for skin and soft tissue infections, such as wounds, abscesses, cellulitis, superficial/juvenile and deep tissue infections. Clavamox also treats canine periodontal disease and urinary tract infections caused by E. coli.