LookML concatenation with space in between fields

[Tusharr_Batra]

Trying to concatenate dimensions and separate them with a space or dash but when I add in the character the new concatenated string does not populate. Simple example - 

Dims - cat, dog

function that does work: concat(cat, dog) = tabbypitbull

desired result: concat(cat,” “, dog) = tabby pitbull


-it was posted earlier in the community, but not resolved. Can anyone please help?