First - welcome to Small Pets and Welcome to your new piggies.
You were given quite frankly shit advice by the Pet Store , though I have had online conversations with guinea-pig breeders who advice trio boars . I bet thet don't offer the advice or pick up the aftermath.
Your boars at 16 weeks are not 'baby' babies . Were they in the "Adoption" bit? Most of their pigs in the main tanks are 8 weeks maximum. (Then they get the next wave of tiny babies that have the upper edge on cute sellability)
You might need to re-jig your boars later (they hit The Terrible Teens aka The Kevin Years) about 6 months or so.
Space , Space and More Space .
C&C are brilliant . You can model and remodel some lovely cage space . I would say two boars need at least 5'x2' so for three boars you'd need more like 6'x2' .
You can do upper levels (though none of my lardy pigs would entertain a ramp)
My original boars were 1yo brothers when they came to us . We found out how boars 'tick'.
They like their own space if they want it.
They need safe houses - which means one cannot trap the other. So if you give them a cardboard box , cut two doors . Have enough space that he can escape through.
Have one house per pig plus a spare .
A couple of food bowls . A couple of water bottles .
Piles of food (veg)
I like to shift things about a bit to keep them guessing (once they're established ) They might move things back if they don't like it.
Your C&C needs lined , guineas cannot walk on grids. I used cardboard , couple of layers.
You can use litter that is suitable for rodents (I use one from The Range , yellow bag. Its wooden pellets . Says on the bag is it suitable for rabbits and rodents)
Guinea-pigs don't tend to be litter trainable but boars (IMO) are tidier.
Our neutered boar spent 18 months beside our sow pair after his two wives died . We couldn't bond them as a Five and not even him plus the younger girls .
Once it was him GP6 and our sow GP7 , we did manage .
He had company though through the bars . Not ideal , he was used to being in a group. But 100x better than GP8 (my guinea) attacking him.
Don't be convinced that neutering stops aggression or mucky habits. It doesn't . (It does reduce the risk of impaction)
But you only neuter to bond with sows . Some Rescues neyter their boars so if they need to bond with sows they don't have to wait . Even if its two boars rehomed , eventually one will be alone , so easier to plan.
Neutering has a risk (low risk but its there) and costs £50-£60 .
Your boars will establish themselves , there will be an Alpha Boar . You will need to watch them , try to pre-empt any situations .
I would recommend the C&C , look online for cage idea.
Stock up on newspaper (they pee a lot)
No shavings or sawdust , it isn't good for them.
Rough fleeces are good with absorbant paper or puppy pads . (Bland detergent)
Get some Gorgeous Guinea shampoo (nice ones are Lemongrass or Just for Boars , Posh'n'Go for conditioning) a bath is a good temper diffuser .
And check the hay carefully . It can be hit and miss. A lot of sticks in ours at the moment
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And we'll need Pigtures 