About 9k classes..

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Hi everyone! Lately I have run through yolo detection models (such as yolov1,tiny-yolov1) and I got very impressed from their ability! Because of the fact that I would need more information on the contents of pictures, I tried yolo9k and I have few questions about it:

1. Is it possible deleting some classes? If I have as input a dog imagine, I would like to see as output just "dog" instead "canine,animal" ect. Already tried raising the threshold , but in this way I can't detect anything in most of the cases.
2. Is there any other parameter that I have to consider (such as hierarchical threshold)? I still can't catch his meaning deeply.
   Thanks in advance!