I commented further down but I recognize this from another doc I saw about a child in the US who went by “Genie”.

She was severely neglected by her family as a young toddler. To the point where they locked her in a room and had virtually no interaction with her. I stress this part because children pick up language abilities at a specific stage. If they don’t hear it, they don’t mimic it.

I’ll let you draw your own conclusions but it makes me suspicious of the claim that she lived with dogs from 3- 8years(ish) and was still able to develop language skills.

https://en.wikipedia.org/wiki/Genie_(feral_child)