Is calcium/mineral block the same as a salt licking stone?
I've had one like the picture below in my cage - and the guinea pigs seem to love it! They alternate between licking the salt and drinking water - to me it seems that the salt helps keeping them hydrated as they drink more.
What are the risks regarding too much salt for guinea pigs?
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Salt is dehydrating though they’re only drinking more to correct that and undo what the salt lick is causing if that makes sense, it’s not a good thing.
There is no need for them to have these or mineral blocks as all it will do is cause imbalances - when fed a good hay based diet, with a variety of veg and a small amount of pellets, they get everything they need, so I’d recommend you remove them so you don’t cause them health issues