I'm really sensitive to fragrances, but fruity scents tend to bother me the least so that's what I usually go for.
I don't understand putting heavy fragrances on animals with such a strong sense of smell. The stuff most groomers use around here makes me gag.
I really like this mellow mango shampoo/conditioner, I found a bottle at a discount store and can't get anymore (without paying $$$) because it's a UK product.
Ocado: House of Paws Mellow Mango Dog Shampoo 500ml(Product Information)
I also saw a shampoo/conditioner at TJ Maxx that smelled like gummy peaches, I wanted it but didn't buy it because I already have 2 bottles of shampoo and only one small dog.