In fact, the dog in question was not merely passing through the tomato patch, but he was helping himself to a ripe tomato right off the vine. Pictured in mid-swipe is Shadow, a five-year-old terrier mix we adopted a few months ago. The shaded area in which he perched created a bluish effect in the image, but the tomato theft is well documented for future reference.
Our veterinarian recommended against feeding dogs tomatoes, by the way, as he noted that dogs who eat tomatoes are prone to bladder stones. Green tomatoes - plus the green stems and leaves - contain the compound atropine, which can cause tremors and heart arrhythmia.
None of our other dogs have shown any interest in eating ripened tomatoes from the vine before, so I will have to pay closer attention to Shadow when he wanders near the tomatoes.