puppy's belly turning from pink to black on the sides

[eversolulu]

We've had our little princess for about a month now, she's 4 months old. When we first got her, her stomach was completely pink, and over the course of this month, the sides of her stomach as turned to black. I thought it was dirt and gave her a bath, but it doesn't seem to come off at all. Is this just how her belly is now or could it be something else?
Here is about a week after we got her
This is her two days ago

Thanks!

 

[malaviKat]

Just looks like her pigment is changing. Their faces will change pigmentation too.

P.S. Such a cute little piggy belly!

 

[KMARINO]

That is normal, Vegas has all kinds of black freckles/spots on his once pink belly.

 

[Davidh]

Completely normal, she may get more spots as she gets older.

 

[2BullyMama]

yep -- agreed ... totally normal.