(not) dirtier than the rest

[squidink]

Hi.

I'm having a little trouble putting together the following sentence.

This dog isn't that dirty, or at least...

A) ...it isn't any dirtier than the rest.
B) ...it's no dirtier than the rest.
C) ...it's no more dirty than the rest.
D) ...it's in no way dirtier than the rest.

I personally think that D is correct, but it's not quite what I'm trying to say. I'm probably really trying to decide between A, B and C. A and B seem grammatically correct to me, while in sentence C it seems incorrect to say 'more dirty', rather than simply 'dirtier' (as in sentence B).

Any advice?

 

[ewie]

Hi Squiddie.

A) ...it isn't any dirtier than the rest.
B) ...it's no dirtier than the rest.
C) ...it's no more dirty than the rest.
D) ...it's in no way dirtier than the rest.

They're all grammatically sound, and all mean more or less exactly the same. (D) sounds slightly unnatural: a very emphatic way of saying something so utterly humdrum.
I don't have any problem with no more dirty in (C): it isn't obligatory to form the comparative of a 2-syllable word ending in y with an er rather than a more.

 

[squidink]

What an excellent explanation... Thanks for the help, ewie.