Dog Training Job - Bellville, WC, 7530

I have two Schnauzers (ages 6 and 5) who are biological brothers. The brother, aged 5, joined our family 6 months ago. He is not used to walking on a leash and wants to attack every single dog that passes us on our walks. He also pees in the house even when I take him out for a late night pee. I also attempted to take his water away at night. This behaviour also instigates my Schnauzer, aged 6, to behave badly. Both of them are barkers of note and it seems to be a Schnauzer thing. Taking them for walks have become unbearable. Can this be fixed?.