I didnt read all 8 pages of this but the last post, i wouldnt just throw deworming meds at him unless you know for a fact he has worms. He obviously is already having issues keeping food down. Generally, meds for reptiles are harsh and that could intensify his issues. You need to find out why he isnt able to hold down food and the explosive pooping. It almost sounds like a blockage of some sorts. He is wanting to eat it sounds like so i would say i dont think its a parasite issue, otherwise he would have a loss of appetite too.
Like i said, i am leaning towards a blockage most likely due to dehydration as you said he did poop. Eating uses a LOT of liquid for digestion so if he is already dehydrated, he possibly wouldnt be able to completely digest the food. I would drop him down to a size or two smaller in food to start with and i would give him unflavored Pedialyte. Not Gatorade or Powerade like some people say lol. You want no sugar or additives. I would also inject his food with pedialyte so you know for sure he is getting liquids. The explosive poop sounds like he is 'dry' and the urates are just dried out inside him creating blockage/plug and he has to squeeze really hard to 'shoot' it out. It is also a reason snakes can get prolapse. Having to push so hard to poop/pee it pops out part of their intestine.
But like i said, if the snake is acting normal and has an appetite, i would check into the hydration. Does he have any wrinkles or stuff? Pat for example got wrinkles around his neck which i am still not sure if it was the shed or partial dehydration. I sprayed him a lot and put elevated water bowls right next to him and he started drinking a LOT and now is filled back out. I never had the issue with the boas or anyone else but they werent shy and GTPs are prone to getting dehydrated.
If you are concerned about worms, get a fecal done first to confirm deworming is needed. It's like when i took Harley into the vet thinking she had an RI again and the vet checked her out and thought she was fine. She thinks the reason my beardie sits with partial open mouth is 1) its normal for beardies to sometimes go derpy and sit with a cracked open mouth and 2) Harley is really overweight(she weighs in at about 700g and is about 15 inches long). So since reptiles dont have diaphragms, they have to constrict their ribs to force the air out of their lungs. So with all the extra weight Harley is packing, it makes it harder for her to breath. If your vet is worth their salt, they wont just throw antibiotics at your reptile and will do a fecal or culture first to find out what is up.
But anyways, nothing wrong with getting a fecal done or culture done but do those first before throwing meds at your snake blindly.
Here is Harley in all her plump glory. No she isnt pregnant. She already laid 2 clutches of infertile eggs last summer lol.
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