Weird that the object detection prompt refused to answer. What other variations of that have we tried? Do you think that's an intentional task that was RLHF'd out or a quirk of some kind?

Thinking out loud some things I'd try:

Find the x/y position of the dog.

What is the center point of the dog?

Give the pixel coordinates (xywh) of the dog in this photo.

Simulate an object detection model trained to find dogs run on this photo; give your output in JSON format.