OK, I'm going to give you the Downsides to guineas.
I love piggies. I kept them from when I was 9-22 and now I'm reliving Guinea-Pig Love after my DD wanted pets when she was 9yo, I convinced her to Go Guinea and now 5 years later we're the proud owner of 5 piggies (We;ve had GP1/GP2/GP3 who have all died, we have GP4/GP5 -sows, GP6 -neutered boar and GP7 /GP8 our new sows)
My DD does a fair wedge of the work, but when we got the first 2 boars , I said the cleaning /buying food and hay was MY responsibility, I'm the adult.
They are messy - mine are indoors in Winter nights, hay gets everywhere and then some.
They have a wooden pighouse , DH had to repair the roof after the flooding recently .
They pooh a lot
Mine are given fresh bedding daily, I honestly could not leave them 48 hours , they'd have to swim (but my boars were tidier/less wee)
They can get very ill, very quickly. When my GP2 was ill, he sat in that "I'm ill" way one morning and even after intensive hand feeding and a vet visit , he was gone within two days.
My DD is fine with smooth or Abby pigs, allergic to Rex, very allergic to Teddy. (rashes on her face)
Hay is a huge allergenic.
You need to make sure they have space, especially boars.
You need to protect from heat,cold,damp,draughts,predators.
You can't just put them in a run on damp grass. Not like rabbits, piggies aren't hardy. Their little bellies are low slung.
99% of piggies are lovely. Some (like my GP5) are a bit bitey. Mine are all Rescues so all have a tale to tell.
Some will be rehomed pets (like our new girls)
Some ex breeder (like my older girls)
Some fight their cagemates (like our boar)
Our piglet GP3 was from a breeder who didn't like guinea pigs (except the ££)
They are the loveliest, chattiest,messiest,greediest little animals.
You will get rewarded by their funny little ways.
Mine are out in their runs at the moment (I have two set ups of run+attatched hutch/house) enjoying some evening grazing.
We put them safely in their Pighouse at night.
I buy packs of hay, gather newspapers, they have equine cardboard bedding (saddlery) and loads of veg , plus pellets.
There are lots of guinea threads on here to read through.
But - the main cause of guineas changing homes is "Kids got bored" or "Child allergic"
You will have your pigs for years and then you have The Ongoing Spiral of adding a pig (or 5
)