How can segmentation be made tighter

[junyuancat1]

Hi，I need some advice on this

1. How can segmentation be made tighter? It's evident that in the example, the segmentation of the dog is not tight enough; I only want to segment the outline of the dog, without introducing any other background information.
   

2.Can the sd model used for filling be fine-tuned? I want to train a new category, such as "sfodglbns," representing a new and unseen species, and then use this species to fill in the tightly segmented outline.

thanks a lot！