Definition: A domesticated carnivorous mammal that typically has a long snout, an acute sense of smell, and a barking, howling, or whining voice.
An ASL-speaking kid Juli's drawing of the dog at age 4.
Phonological acquisition: The baby Juli (age 0;7) first connected the ASL sign with the black dog. She was introduced to both versions: the regular ASL word (#DOG) and the baby talk (tapping on the leg).
Interesting, she used both versions at 12 months. She 'babbled' the lexicalized sign (#DOG).
The two-word stage typically emerges at around 18 months. In the video, her phrases show IX DOG TIRED at 1;5, DOG PET EAT at 1;7 and IX DOG MAD (The dog is mad.) at 2;1.
At 2;10, she explored a classifier phrase for DOG and PERSON, using classifiers and reciprocal verb.
From 2;11, her lexicalized sign #DOG developed somehow mature and she learned how to fingerspell the word for DOG. It appears that both of them require a different process in the brain. One is produced as a whole ASL word and the other one is a series of the alphabetical letters which requires a more skill long before one can write the word on paper. At around 3;5, she fingerspelled the word letter by letter. That goes the same for typing the word (see 3;10).
"Clifford the Firehouse Dog" by Norman Bridwell. ASL signed/translated by Jeni Jackerson, 2019.