What about "It is a too big dog"
:lol:
***** NOT A TEACHER *****
I believe that your sentence is fine
if you change the order of the words a bit -- just as tzfujimino told us:
Wife: Why won't the manager of our new apartment let us bring our darling dog with us?
Husband: She says that
it is too big a dog for that small apartment.
"It is a too big dog" is not idiomatic (that is, native speakers have decided not to use their language that way).
*****
Here is how
A Grammar of Present-Day English by Pence & Emery explains it:
"Sometimes the article
a (an) is placed immediately before a noun ["a dog"] that is modified by an adjective ["big'] or an adjective that in turn is modified by an adverb ["too big"]."
Here is an example that they give. (The dialogue is only my idea)
Mona: Everyone in country X is intelligent.
Tom: Well, yes, the people in country X are, indeed, very intelligent, but I think that to say everyone there is intelligent
is
too sweeping a statement. ("sweeping" = wide. In other words, there must be some people in country X who are
NOT intelligent.)
*****
Here are some more examples from
Harper's English Grammar by Dr. John B. Opdycke:
too severe a strain
too great a sacrifice
HAVE A NICE DAY!