As I understand it, oils and such never reach the part where the problem is, it's getting absorbed in the gut. Point is so get something that reaches the problem. Lactose has great effects on my civvie, so does paraffin oil - it coats the poop and speed the process. Lactose makes the poop more moist so it can pass easily. Hydration is the first step, then fibres like HUSK. But be careful with fibres, they can lower the BG. They make sure the gut has to move, gives volume and increases the motility.
For an emergency where my civvie can't poop, I give him an enema, within fifteen minutes the bowl is emptying, only work locally in the lower part.
To prevent I use fiber, and when I leave food out for the night, it's more like a soup, lots of water in the canned food, preferably hot so it smells more. Sometimes I can even feel the hard poops when I give him a tummy rub, I just gently but firmly move my hand in circular movements, after some time his gut starts to say those sounds like its processing.. later he goes and do what he's supposed to do
I use lactose as a last resort. It took me months, a few years ago to get him off it again, even though I did taper down very slowly. But if he's saying noises in the litter box I'm going to the vet to get a real enema, when he complaints it's serious. And even the vet couldn't get it all out.
For him it's fur and hair, my hair even... that clogs him. I believe mega colon sometimes can be the result of constipation, so if I were you I'd get him emptied out soon as possible.
I've also tried a motility drug, metoclopramide, also used for nausea, but it hurt too much. Pain meds that isn't effecting the gut is also a good idea. No one wants to go if it hurts..
I feel challenged on my language today. Let me know if it's not understandable
Point is, I'd try the vet first. Make sure it's "only" poop that's in the way, possibly get an enema and and prevent it from happening again. If it's hair, more brushing. Lack of fluid, give more. If you feed raw, give less bone more intestines. Add fibres to keep it going, that must be the only good thing about dry food. More poop and fibers, but counteracting the fluids. Feeding good quality they can actually use makes less poop, less poop means less movement and lazy bowls
