Has the translator not read this? They translated it to 'dog eyes' instead of 'bitch eyes"...

It makes more sense, since "bitch" is originally for female dogs and his brother is a man

I thought it was becuz dog-eyes sounds more like dojin than bitch-eyes

"bitch eyes" and "bitch teeth" has been used several times throughout the story (those terms have already been established as their nicknames for each other) in the official translation, this is the first time they've used dog, so the translator must be new and didn't bother to read the rest of the story.