A simple photo log can be surprisingly powerful with dog bald spots. Take pictures in the same light every 3–4 days, and note itch level, bathing, new foods, and any new products. You’re looking for visible direction: is the patch expanding, staying stable, or showing fine “fuzz” regrowth? Those changes help your vet decide whether to escalate diagnostics or stay the course.
Also track the skin itself. Hair can lag behind, but comfort often improves first: less redness, less flaking, less odor. If the skin looks worse while hair loss spreads, that’s a stronger signal to recheck. Demodicosis, for instance, can be associated with underlying issues and warrants veterinary evaluation (Huang HP, 2013).