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Are you sure your guinea pig is a he?
When female guinea pigs come into season they can pass a mucus plug, which will look like a thick white discharge. There is not usually very much of it though.
If he is a male, the other thing it could be is that guinea pig urine is highly calcified, so it will appear thick and cloudy. If it becomes too calcified though, this can lead to bladder stones.
The other possibility is that he has become sexually excited, and what you are seeing is semen. Guinea pig semen sets like glue, this can lead to problems if the penis is stuck out.
Keep an eye on him for now, if the discharge becomes persistent, you will need to take him for a check up with your vet.
Kind regards XXXXX XXXXX
Thank you for the information I am thinking that it might be semen cause we do have
two Guinea Pigs (and no babies for a year :), they share the cage together. They also keep trying to dominate each other, you know, climbing on each others backs and fighting also.
We hoped that this fighting and dominating "action" would subside but they conitnue to go at each other constantly (we've had them for a year).
Do you have any suggestions to making them live happily with each other?
And not to have this mess?
Guinea pigs are sociable animals and will usually get along fine in company.
2 males will usually get along so long as there are no females around.
You may need to give them more space and more areas to hide in so that they can get away from one another. If they really can't get along you may have to divide the cage, so that they can see each other, but not fight.
Both these sites have lots of useful information.
I hope this helps, regards Fiona