why not et blå dyr?
It is because dyr is a t-word (t-ord), so we need to use it also with its adjective, which is blåt.
Can you help me with t-word
shouldn't "en blå dyr" be accepted?
"Dyr" is neuter gender. Therefore every article and adjective is changed to et-form. "En" is "et" and "blå" is "blåt".
It's "et blåt dyr" because dyr is a t word