Help Needed - Male cavy making ODD new sound - Has anyone heard this?

[AMC1227]

VIDEO HERE, SOUND IS AT 2 SECOND MARK
The sound in question happens at about the 2 second mark in the video I posted above. The sound is coming from the white guinea pig

To elaborate, my guinea pig is a male and about 3.5 years old, with no prior medical problems. I heard him make this noise yesterday for the first time, it's a sound much lower than his usual wheaking/squeaking and it's hard to describe. I have not found any info or other recordings of this sound online, and it doesn't sound like a cough/sneeze.


He is eating, drinking, and pooping/peeing as he normally does. I have another male guinea pig that is the same age and they get along like brothers, they almost never "fight" so I don't think this sound is directed towards the other guinea pig.


I called the emergency vet but can't get in with them until tomorrow, which is why I'm looking for help here in the meantime.

 

[Siikibam]

Did he do it while toileting? Your best bet is to keep an eye on him and get him to the vet when you can.

 

[Wiebke]

Hi!

Your boy is very likely feeling painful when pooing or peeing. This painful grunting is in most cases connected a problem in the urinary tract; either a bacterial urine infection (UTI) or a bladder infection (cystitis), which can be bacterial or sterile. Alternatively it could be connected to stones or sludge in the in the bladder or urethra. Your vet will likely give you an antibiotic to treat any bacterial infection; the next step if that doesn't solve the problem is checking for stones or sludge with an x-ray. If that comes back clear but problems persist, then a sterile (i.e. non-bacterial) interstitial (i.e. recurring) cystitis is most often the culprit. It can only be diagnosed by default and only be managed but not healed.

Alternatively the problem could sit in the penis shaft. Are you checking your boar bits regularly? If not please ask your vet to check them, too, in case a semen rod is stuck.
Boar Care: Bits, Bums & Baths

What is your diet? Are you filtering water and how much pellets do you feed?
Long Term Balanced General And Special Needs Guinea Pig Diets

Please see your vet tomorrow; that is fine. If it is a UTI or a cystitis of some sort, then it takes a few days for symptoms to manifest so it is not an emergency.

The only emergency is when piggies are suddenly looking very ill and refuse to eat or if any piggies, especially sows, are bleeding from the anus. In the first case it is very likely a stone has been washed from the bladder into the urethra and is blocking the flow of urine. And pure blood as opposed to deep red porphyrine pees which are characteristic for the onset of a UTI or cystitis is always cause for concern. Thankfully either of these things are not all that common but it is good to be aware of them.

All the best!