I have no idea if putting fluids in a rat's rectum would be beneficial if they're dehydrated but I can offer my experience with giving a rat a sort of enema.
Smidgen has an tumor in her "nether regions" - I forget the medical term for it, inguinal maybe? anyway, she had become constipated because I'd given all the rats some puffed rice, as one or more of them had loose poops, and not knowing who it was, I gave the puffed rice to everyone.
Well Smidgen is a bit of a little piggie and she grabbed as much of the puffed rice for herself as she could and with this growing tumor near her anus, she got constipated and couldn't pass the stool.
Took her to the vet and the vet used KY jelly and lubed her up really well then put the tip of the small syringe in her anus and put about a half a cc or so of KY jelly in her rectum.
this helped her to pass the dry hard stool along with some massage to the area.
Smidgen was extremely tolerant of this- she didn't fight or squirm at all. I think she knew it was helping her, and when she finally was able to pass the impacted stool, she let out a little yelp as the biggest pc passed thru but after that, the rest came out and she was clearly so relieved.
I needed to lube her with a KY jelly "enema" a couple more days after this til the diet change (daily fruits) helped to change her stools back to normal.
So, just wanted to add my experience with inserting something into a rat's butt.
:giggle:
As
RattusNorvegicus said, I could hold her tail up and her anus would open somewhat, and that is actually how we first saw that she had impacted stool, you could see it right there ready to come out but stuck because it was too big and dry.
Smidgen didn't seem to even feel the syringe going in with the KY jelly and she didn't fight at all.
I don't know if having that tumor down there is why this was so easy to do- for all I know the tumor is pressing on something so that she can't feel things down there..? or maybe just having a large growth that has distorted her anus and other organs has made her immune to other unpleasant sensations in that area, I have no idea.
I just wanted to say that I don't think there are any absolutes. There might be a situation where giving something rectally will be the most helpful thing. It might not be anyone's first choice, with such a small animal as a rat, but I don't think it should be dismissed as never possibly being helpful.
that said, it was a
vet who did the first enema and I would not have attempted it myself without seeing how it was done first, to see if it was even something I could handle.
It was not an exotics vet who did this, and this was, in fact, HER first rat enema. She was very proud of that :giggle:
I hope that if this vet ever needs to do one again, it goes as smoothly as it did with my very tolerant Smidgen.
and I hope I never have to give one again, but I would not rule out the possibility that something like this might help a rat.