Caleb's concern is about the care of the animal because his mother will not be responsible for it.
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La preocupación de Caleb es por el cuidado del animal porque su madre no se hará cargo de él.
In this case, a dialogue between Caleb and Soli (friendship relationship) is shown talking about the new dog that is going to come to their family. Caleb worries about the dog because his mother has already told him that she won't take care of him.
Remember that...
In a dialogue it is a conversation between two people (let's call them A and B) who talk about various topics. It is common to see a question and therefore an answer in a dialogue.