Not on Duo it's not ;)
That sentence is actually about 野草.
Собака ніколи не забуває своє перше дерево!
This is my first tree is a strange sentence which I cannot imagine ever hearing or saying
Person who lives in an apartment goes to a park and plants a tree. I know it’s kind of sad but some people have never had a tree.
The "Це" (TSE) sounds more like CHE in the recording, or it my bad hearing?
I typed "це моє першу дерево" by mistake, but it is accepted without comment.