I don't understand pet owners are like this. All they need to do is type their question into Google, read a few reputable looking sites and come to the most likely conclusion...However, I have just done this myself and pretty much all the links say they ARE natural swimmers as they are related to the Capybara..and of course, since we are related to Chimpanzees, then we can swing from trees also!
The first link to come up was this:
Can Guinea Pigs Swim?
Guinea pigs are natural swimmers.
If you do put your guinea pigs in water, some may love it , some may hate it.
Just like humans really!
They can swim but do find it very distressing if they are forced to swim, just like us!.
...however, domestic cavvies are not used to swimming and most will find it very distressing because they are just not used to having been breed in a domestic dry environment.
..and then it proceeds to inform you exactly HOW you can test if your guinea pig likes swimming! Basically encouraging it. I can see how many people would be confused since the site appears reputable. I mean, forcing a domestic piggy to swim has no function except danger. Hopefully, no guinea pigs drowned due to their irresponsible suggestions.
I have read on
another site how 'Guinea pigs live in the wild in South America, living in rocky areas, grasslands and forest edges. They live in groups of about 10 adults, and live in burrows, either dug by themselves or by other animals. They are most active at night, when they come out and forage on a wide variety of plant materials.'. I imagine they have no reason to swim and put themselves in danger with crocodiles, snakes or any other predators as there is zero food for them in the water.
I have to groom and shower 4 of my piggies and I can tell you that none of them like even a splash of water on them! 3 of 4 will just try their best to get out of the bath and eventually, 2 of them will start shivering in fear and one will poop her guts out. This highly suggests to me that water + piggies = No lol