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Actually, I think you have the right board - but we need more information.
Weight is a big deciding factor when buying a SUP, and width is also very important.
At 78kg you would buy one type of board, but if you want to add a 25kg dog, then you need a different type of board.
I don't know the 404 range, and I have not used a Nalu (but they come highly regarded), but you will appreciate the extra width of the 404.
Assuming it is the 404 "floater" it is approx 170 litres which is just 10 litres more than the Nalu. So the extra width and volume, albeit slight improvements, are in your favor.
https://404sup.com/collections/boards/products/10-6-floater