"scaanful dog eat dutty puddin," means don't scorn anyone or anything, because the minute you do you could be eating something even more dangerous and dirty or dealing w/ a situation more dangerous or dirty...such as the wrong friend if you scorn a certain group or kind, and rather another due to popularity reasons...
Dutty meaning dirty,
Scaanful meaning scornful
Scorning mickey deez wit a class d just to go to redlobster to eat from someone's pissy/shitty hand, so in dat case
scaanful dog did eat dutty puddin....