Can Dogs have Mustard? Posted bydoctorpooch September 11, 2019 Leave a comment on Can Dogs have Mustard? I have the answer to this question. You can ask me on Alexa, Google or Bixby.Alexa, ask Doctor Pooch, can dogs have Mustard?Hey Google, ask Doctor Pooch, can dogs have Mustard?Hi Bixby, ask Doctor Pooch, can dogs have Mustard?