Shampoo with longest lasting smell?

[romeosangiovese]

I find that the scent from Les Pooch shampoos last the longest. It is not cheap, but to be fair, I bought a gallon when Romeo was 1 and still have some left (he's turning 4 and I would shower him once every 2 weeks on average). You can dilute it by quite a bit (1:10) and the smell still lingers. No doggy smell even at 2 weeks, sometimes 3 weeks.