Belgian Malinois Breeder Wanted

My daughter owns a 2 year old Affenpinscher. He eats all kinds of iaprpronpiate items underwear, socks, chews holes in blankets and towels, tissues, rocks, leaves, sticks. Also, he is house trained, but occasionally he will go on a two or three day spurt where he will only poop in the house even though he has had plenty of opportunities to do it outside. He will not come when called if he's outside. The main thing we are concerned about is the iaprpronpiate items he eats. What do you suggest?