How do you know when goose is cooked?

The surest way is to use a meat thermometer. Stick the end of the thermometer into the thickest part of the goose. If the internal temperature is at least 165 °F (74 °C), then you're good to go! If it isn't, stick it in the oven to finish it up. Another trick you can use is to check the juices. Take a knife and cut into a thick part of the goose. If the juice runs clear, then the meat is fully cooked. If there's any pink or red in the juices, then it need to cook a little longer. Never eat goose or any other game meat that isn't fully cooked to avoid potentially eating pathogens or contaminants that could make you sick.