Dash in CtB uses "fruit-ryuuta.png". If you made animated catcher, you need to add base sprite of your character.
fruit-ryuuta.png - will be used as dash (might need some positioning if you want to make it correctly with animation.
fruit-ryuuta-0.png
fruit-ryuuta-1.png
fruit-ryuuta-2.png
fruit-ryuuta-3.png
etc... are animations of your character. This is the only one exception where animation overrides base sprite.
fruit-ryuuta.png - will be used as dash (might need some positioning if you want to make it correctly with animation.
fruit-ryuuta-0.png
fruit-ryuuta-1.png
fruit-ryuuta-2.png
fruit-ryuuta-3.png
etc... are animations of your character. This is the only one exception where animation overrides base sprite.