It's easy for me to seperate mine because there are 3 people who live here & some one is always with one of the dogs. We are hermits & pretty much stay in our rooms.
One dog will get the run of the house during hte day while the other is in a bedroom ( which is how they are "crated") & at night we switch. Both dgos get time with Ollie ( she's thrilled
) and both dogs have pretty much equal time with us. There is whining & crying but we ignore it & they stop. Munkee used to be MUCH worse & would cry all day but now he will whine for a few minutes & stop. Ignoring this is key, don't give in to them. I started by spending an hour at a time with one of them being able to have the run of the house, when that hour was up the other dog had their turn & I gradually increased it. They let me know when they need to go out & the "free" dog goes to their room while the other is out in the yard. If it's nice out I can have one in the yard & one free in the house. I have an eye on the outside dog at all times. After 3 years it has become routine & I will wake up from a dead sleep when Munkee wants go pee & look for Justice to make sure she is not out of her room. What did help us is to put notes up on the door as a signal to who was where. Now we just automatically look for them. It's a pain at first but you will get used to it rather quickly. One other thing that helps us is that knowing who is where is MY responsibilty, having one person in charge is easier & it makes it harder to make mistakes. Any time a door is opened I am asked where the dog is. It'll be routine in no time. you might also save a special treat like a raw meaty bone for the crated dog so they don't get too bored. This is routine to the dogs too, when Munkee hears my daughter's door open he comes to my room & waits for me to shut the door, Justice is the same way.
There's a fine line between genius and insanity. I have erased this line.