OXA-23 carbapenemase on transposon Tn2008 is found in Acinetobacter baumannii isolates from dogs. A. baumannii international clones IC1 and IC2 are emerging in dogs and cats. OXA-66 β-lactamase with upstream ISAba1 is frequently detected in IC2 isolates of dogs/cats. A. baumannii appears to be a nosocomial pathogen in veterinary clinics. Animal A. baumannii share resistance determinants and clonal lineages with human isolates.