The rule of thumb, for all specialties, in Canada is that to be board-certified the length of training in the US must equal the length of training in Canada. Psychiatry in Canada is 5 years so one must do a 4 year psychiatry program here in the US plus one year of fellowship in order to have 5 years total. This means automatic fellowship in the US, or so I understand. Currently the residency must also be ACGME accredited, AOA (osteopathic) medical training is only accepted if someone went to a DO school and then did ACGME residency.