The Merino is a long-haired, curly-coated guinea pig—essentially a Texel with a rosette (crest) of hair on the forehead. Its dense, wavy coat is striking but demands regular grooming.
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From the minimum an animal needs to be kept humanely, up to the ideal setup. Bigger is almost always better — minimums are floors, not targets.
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Minimum
Single guinea pig floor space
≈ 7.5 sq ft (1080 sq in)
Continuous ground-level floor — guinea pigs do not use vertical levels and should not be kept in tall narrow cages. They are herd animals: keeping just one is discouraged in many regions. Merino is long-curly-coated — same welfare floor, plus regular grooming to prevent mats.
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Recommended
Pair of guinea pigs
≈ 10.5 sq ft (1500 sq in)
C&C (cubes-and-coroplast) grids make it easy to reach this. Add hides at each end, a hay rack, and separate eating/toilet zones to reduce squabbling.
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Ideal
Herd with extra roaming
13+ sq ft plus daily floor time
Generous pen for a small herd, supplemented with supervised floor time on a washable surface. More space dramatically reduces stress and boredom-related behaviours.
Life & growth stages
How this animal changes through its life — each stage often has its own care, diet and space needs.
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Newborn
Newborn mammals are nursed on their mother's milk. Many are born helpless — blind, deaf, and sparsely furred (altricial, as in dogs, cats, and rodents) — while others stand and follow within hours (precocial, as in hoofed livestock).
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Juvenile
After weaning, juveniles grow quickly and become increasingly active, playful, and independent. Adult coat, proportions, and (in many species) the permanent teeth come in as they approach full size.
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Adult
Adults reach full body size and sexual maturity, with the species' mature coat and build. Sexual dimorphism — differences in size, mane, horns, or markings — is pronounced in some mammals and subtle in others.
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Senior
Senior animals show aging signs such as graying fur, reduced activity, and a greater need for veterinary monitoring of joints, teeth, and organ function. Lifespan and the onset of old age vary widely by species and size.
Color & pattern variants
Natural variants occur in the wild; selectively bred (man-made) variants were developed in captivity.
A large solid-bottom cage or C&C enclosure (at least 0.7 m² for a pair) with soft, clean bedding such as fleece or paper bedding that won't tangle the long coat; avoid sawdust that mats into the curls. Keep at 18-24 °C away from drafts, damp and direct sun. Provide hides, a hay rack and space to popcorn and run.
Diet
Unlimited grass hay as the dietary staple, a measured daily portion of vitamin-C-fortified guinea-pig pellets, and a daily serving of fresh vitamin-C-rich greens and vegetables. Provide fresh water at all times. Trim coat hair around the rear to keep food and droppings out of the curls.
Behavior & temperament
A show and pet breed with no productive purpose. Generally calm, friendly and tolerant—the long coat means many are bred and handled for showing, so well-socialised Merinos are docile and enjoy gentle attention. Like all cavies they are social herd animals that should never live alone.
Health
The long curly coat readily mats and traps feces and urine, risking skin infection, fly-strike (especially in warm months) and overheating. Routine vitamin-C supplementation prevents scurvy. Also watch for dental malocclusion, bumblefoot, respiratory infection and ovarian cysts in sows. Not a hairless breed, so no associated lethal genetics.
Tips, DIY & hacks
Groom several times a week—daily for show animals—to prevent matting; many keepers keep the coat trimmed shorter for easier pet upkeep. Keep the rear end clipped and check daily in summer for fly-strike. Spot-clean the coat rather than over-bathing. House with at least one compatible companion.