ACCOMODATION
Guinea pigs need as much space as you can possibly give them. The minimum required for 2 is a 4 foot by 2 foot hutch, with a run in the garden for when it is nice. The rule of thumb is for every piggy you add you will need another foot, e.g 2 pigs = 4 x 2 ft hutch, 3 pigs = 5 x 2 ft hutch and so on. The run need to be as big as possible as well.
BEDDING
I cannot express how important hay is to guinea pigs. It keeps the gut healthy and also keeps their teeth trim. Sawdust is not a good idea, this can get up their noses and cause many respiratory problems. I use just newspaper and hay, this is cheap and easy to clean.
Pro-fleece or vet bed can be used. This draws the urine to the bottom of the material and if washed every few days it shouldn't smell. Though this can be expensive it will last forever,(note, fabric conditioner must not be used when washing this).
FEED
A good quality pellet is essential. If you have a mixed sort and you are finding they are leaving bits at the bottom of the bowl then it is best to slowly change them over to a pellet feed, as then they get all the goodness they need. Guinea pig Excel is a very good food to buy. Guinea pigs can't produce their own Vitamin C and so it is essential that they have some fruit/veg a day to provide this.
LAST BUT NOT LEAST
Guinea pigs should never be kept with rabbits. Rabbit need a totally different diet and a rabbit can kill a guinea pig with just his feet. Please never put them together even in the garden for a run
Guinea pigs are very social and need the company of another guinea pig. Two males work well together especially if they have been together from a young age. Only put a male with a female if he has been castrated, otherwise baby pigs will follow in 10 weeks, and although this might sound lovely, it is stressful for the mummy pig, very expensive, and there are hundreds of piggys in rescues that need new homes, so please don't add to the problem.
Lastly guinea pigs love lots of cuddles and playtime outside of their hutch . Enjoy!!!!