MY69RS

i have two pups that are now 4 months old we have had them for a month now. they have been in the same crate till yesturday " my bad i didnt know to seperate them". My problem is they use the crate as a potty sometimes. i have caught my male come in from outside go right in the crate and use the bathroom. It makes me so mad sometimes. They can go for a day perfectly they three that drive me nuts. im now gonna seperate the two and see how it goes any help would be greatly aperciated!!