Shadow Mastif as a familiar?

[Shin Okada]

Does any of the official books allow a wizard to take a Shadow Mastiff as a familiar?

If not, assuming the wizard takes Improved Familiar feat, what kind of requirement (say, caster level, BAB and such) will be appropriate?

 

[Rabulias]

Dragon Magazine 322 offers the Darkness Familiar feat (p.67) which includes the shadow mastiff as an option with a minimum arcane spellcaster level of 14.

 

[Shin Okada]

Dragon Magazine 322 offers the Darkness Familiar feat (p.67) which includes the shadow mastiff as an option with a minimum arcane spellcaster level of 14.

Thank you very much. I will check that issue.