This one is very similar to buttercup. It makes many tiny yellow blooms which are great for little pops of colour in bouquets.
 
Colour: Yellow
Form: Pompon
Bloom Size: 2”
Plant Height: Medium (3' to 4')
 
Oops... skipped picture day! If you would like to see what this variety looks like, below is the link to google images.
 
dahlia yellow baby - Google Search