Guinea pig cage size for 2

For two guinea pigs, Humane World for Animals publishes 7.5 square feet as the bare minimum and at least 10.5 square feet — about 30 x 50 inches — as the figure to provide, with sides at least 12 inches high and a solid floor. In inches that is 1,080 square inches minimum and 1,512 preferred; in metric it is 0.70 and 0.98 square meters. The gap between those two numbers is three square feet, which is roughly a third of the cage, so which one you build to is a real decision rather than a rounding question.

The reason a pair gets its own figure is that a pair is the normal case. Humane World states that guinea pigs are highly social and that it is best to have at least two who get along with each other, so a single-pig cage is something most owners should never be shopping for. If you arrived here from a cage listing that quotes a figure for one guinea pig, that listing is answering a question you do not have.

The figures in every unit you might be working in

One thing that table makes obvious: the bare minimum for two guinea pigs is the same area Humane World gives as the bare minimum for one. The second animal does not come with a second allowance until you move up to the preferred figure. That is the clearest argument there is for treating 10.5 square feet as the target rather than the ceiling.

Does it change for two males or two females?

The published figure does not. Humane World gives one set of numbers for two guinea pigs and does not split by sex, and we are not going to invent a male-specific figure that nobody has published — the autocomplete variants asking for one are real queries with no real answer behind them.

What is defensible is the direction. Two boars that have been raised together generally live together well, and where a pairing does break down it tends to be between males, and space is one of the levers that reduces the pressure. So if you are housing two boars and choosing between a cage at the minimum and a cage at the preferred figure, that is a reason to buy the larger one — not because a different number has been published, but because a bonded pair with more floor has more ways to get out of each other's way. The same logic applies to two sows that have not been raised together.

• Two or more hides, each with two exits. A hide with one entrance is a dead end an animal can be cornered in.
• Two of everything else: water bottles, hay piles, food bowls. Competition at a single resource is where most pairs first get tense.
• A straight line to run in. 50 inches gives a pair a run; 36 gives them a corridor. This is most of what the extra three square feet buys.

What to do if your cage falls short

Most cages sold for two guinea pigs land between the two figures, so this is the common case rather than the unlucky one. In rough order of how much it helps per pound spent:

1. 1.Extend it, if it is modular. A C&C cage grows by two grids and a connector, which is the cheapest square footage in this hobby by a wide margin. A 4x2 becomes a 6x2 for the price of a few parts.
2. 2.Add a connected run rather than a loft. A ramp to a second level adds area that Humane World's figure does not count, because the floor figure is continuous floor. A pen attached at ground level does count, when it is attached rather than used an hour a day.
3. 3.Give daily floor time in a pen. Real and worth doing, and not a substitute: the figure is for the enclosure the animals live in.
4. 4.Do not add a second small cage. Two 7-square-foot cages are not a 14-square-foot cage, and splitting a bonded pair to solve a space problem creates a worse one.

The other figures that come with a pair

Area is the headline and three more published figures decide whether the cage works day to day.

• Side height: at least 12 inches. Humane World's figure. Guinea pigs are not great climbers, so this is about containment and drafts rather than escape.
• Flooring: solid, never wire. Humane World rules out plastic tubs, glass aquariums and wire floors by name. Guinea pig cage liners and bedding are the two ways to cover a solid base.
• Temperature: 17-20C ideal, indoors below 15C, heatstroke risk above 26C. The RSPCA's band, and the reason an outdoor pair needs a weather answer rather than a bigger cage.
• Cleaning: deep-cleaned at least weekly with daily spot cleaning. Also RSPCA, and it scales with the number of animals — which is the one argument for a smaller cage, and not a good enough one. How often to clean a guinea pig cage goes through it.

If you have landed here while still choosing a species rather than a cage, chinchilla vs guinea pig sets the two requirement sets side by side, and the shapes are nothing alike: a guinea pig's allowance is floor and a chinchilla's is height.