Are Max and Goofy colourblind? (eta: Dogs do see colours, they just see far less than the average non-colourblind human. They are dichromatic, they see blue, and yellow, and mixes of the two, but it's all fairly pale compared to what humans experience, we think.)
If they are, then they'd be able to tell the Duck triplets apart by scent, in person, but seeing them in pictures or video from before they started dressing in different styles (instead of the same thing in different colours) would be more challenging.
...Do ducks have a sense of smell? eta: Apparently yes!
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