We do not alter until they are at least 2, and with my current brood, I have an intact male, and 2 intact females (one senior still goes into heat, and a puppy who hasn’t). My male Husky/GSD has a very easy time when my senior is in heat. We crate him, use different areas of the backyard (multiple different fenced areas), and never let them out together.
With my female senior, she’s never had any issues either when in heat. She gets a little more clingy, but other than that, there’s almost no difference. She is very good at keeping herself and her areas clean, so we don’t need the panties. She cleans up after herself better than my kids do! However, she is the first female I’ve kept intact, and she was rescued from a breeding ring, and had countless litters before she came to me, so I’m not sure if that makes it easier with her than other females that haven’t had pups. I don’t breed, and have no intentions of ever breeding! It’s hard work, more than I’m willing to do (bad experience with my rescue and her pups), so we will either spay our female at 2yrs, or neuter our male, he’s past the two year mark. We haven’t done it yet because we have had zero issues with them both intact. We will not spay or neuter unless our male reacts badly to the pup when she does eventually go into heat.