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HOUSING   

When selecting your cage, a rule of thumb to
remember is that each cage should be large enough for
the guinea pig to exercise freely because pigs love to
run and jump when they are healthy and happy.  It is
recommended to have at least 3 square feet of space
per pig.  An overly tall cage is not practical since
guinea pigs do not hop like rabbits or climb like
hamsters.

Wire bottom cages will cause foot infections, broken
legs and ripped toenails.  They must never be kept on
wire!  Research has been done on the use of wire
floors and proven that they fare much better and are
much happier with a solid floor.  Cages made
specifically for guinea pigs do not have wire bottoms
and if your cage does then cover it with a thick layer of
newspaper topped with shavings.

If your budget does not permit you to buy the biggest
cage possible then another alternative would be to
make your own or have one built for you.  They will
need more space to be happy and healthy, so the
bigger the better.  Not only would it be cheaper in the
end, but also you can have it built to suit your room size
and decor.  
Kathy's Theme Cages

Keeping guinea pigs in a fish tank has been done for
years, but it has never been practical. Fish tanks
generate heat because of the glass, and pigs are
extremely susceptible to heat stroke.  Without proper
ventilation, he must endure the strong smell of ammonia
because of the four solid walls.  Solid colored plastic
tubs are quite popular as well.  Unfortunately, they are
the same as the fish tank but with one thing added –
isolation - especially if you have only one pig.  Guinea
pigs are naturally curious and social.  When they
cannot see, hear or smell what is going on around them
this could possibly lead to languidness and a greater
fear of humans.  If you get your pig a companion, the
big plastic tub would work well.  

Just remember one thing:
AN ONLY PIG IS A LONELY PIG,
no matter what he is housed in.