Nah, the last girl had been introduced in ch. 1. She was the Demon King's daughter and saw Lloyd kill her father, swearing revenge at the time.What do you mean "called it?" We were told she would be in the first chapter. There's another girl who hasn't been introduced yet who is also going to be adopted. Pretty sure all four of them are on the first cover and in the manga's basic description.
dont worry this dog is just abnormally sized but it doesnt biteLet me guess, the king will sent them to subjugate a fenrir and it become their pet