Why would it not be 'a big dog'?
Because "tha" means "is".
Ceart gu leòr, mòran taing.
I think "a big dog" means "Cù mòr"
It make more sence a big dog
Why are we using an accent on "mòr" here?
That's how it's spelled.
Is "the dog is big" really incorrect? What would that be in Gaelic?
"The dog is big" would be "Tha an cù mòr."