This is the 8739th most frequent German word.
krull
The German word "krull" is not standard; it may refer to "Krull" as a surname or rarely mean "curl" in certain dialects.
Here, 'krull' is used as an adjective to describe the fur of the dog being curly.
Der Pelz des Hundes war dunkel und krull.
The dog's fur was dark and curly.
In this case, 'krull' acts as a verb, indicating the action of curling hair.
Sie krullte ihr Haar für die Party.
She curled her hair for the party.
'Krulligen' here is used as an adjective in its inflected form, describing the appearance of patterns on the dress.