Degu — Juvenile & Adolescent

The juvenile period for degus spans roughly from six weeks to about six months of age, during which these small rodents undergo dramatic physical changes. At weaning, a degu pup typically weighs around 40 to 50 grams, and by the time it reaches full maturity, it will have more than quadrupled that weight. Growth is rapid during the first three months, then gradually tapers as the degu approaches its adult size of approximately 170 to 300 grams.

During this phase, the degu's skeletal structure is still developing and hardening. The long bones of the legs continue to lengthen, the skull reaches its adult proportions, and the tail—one of the degu's most distinctive features—grows to its full length. It is important to note that the degu tail is extremely fragile and can be permanently lost if grabbed or caught. Never pick up a degu by its tail, and ensure that cage accessories do not have gaps where a tail could become trapped.

Dental development is ongoing throughout this stage. Degus have open-rooted teeth that grow continuously throughout their lives, and establishing proper chewing habits during the juvenile period is critical for long-term dental health. Provide a constant supply of high-quality timothy hay, untreated wooden chew toys, and pumice stones to encourage natural tooth wear. Misaligned or overgrown teeth in young degus can quickly become a serious veterinary concern.

Coat changes may also be noticeable during adolescence. The soft, somewhat downy fur of the young pup gradually transitions into the sleek, agouti-brown adult coat. Some degus may go through a brief period where their coat appears slightly patchy or uneven as the juvenile fur is replaced. This is a normal part of development and should resolve on its own within a few weeks.

By six weeks of age, juvenile degus are fully weaned and eating solid food exclusively. Their diet should center on high-quality grass hay, which provides the fiber essential for both digestive function and dental wear. Timothy hay is the gold standard, though orchard grass and meadow hay are also suitable options. Hay should be available in unlimited quantities at all times and should make up the vast majority of the daily diet.

A measured portion of plain, high-fiber pellets formulated for degus or chinchillas can supplement the hay. Avoid pellet mixes that contain dried fruit, seeds, nuts, or colored pieces, as these additions are typically high in sugar and fat. Degus are uniquely susceptible to diabetes due to their inability to efficiently metabolize sugar, and dietary management beginning in the juvenile period is the most effective way to prevent this condition from developing.

Small amounts of fresh vegetables can be offered daily as enrichment and a source of additional vitamins. Suitable options include dandelion greens, small pieces of bell pepper, fresh herbs such as parsley and cilantro, and occasional broccoli florets. Introduce new vegetables one at a time and in small quantities to monitor for digestive upset. Avoid all fruits, carrots, corn, peas, and any vegetable with a high sugar or starch content.

Fresh water must be available at all times through a sipper bottle with a metal spout. Check the bottle daily to confirm it is dispensing properly, as degus are notorious for blocking the spout with bedding or food particles. A backup water dish can provide insurance against bottle malfunctions, though it should be heavy enough to resist tipping and cleaned frequently to prevent contamination.

Adolescence brings a surge of energy, curiosity, and boldness in young degus. Animals that were once content to stay near the nest will now explore every inch of their cage, test boundaries, and investigate any new object or sound with intense focus. This heightened activity level is completely normal and reflects the degu's natural intelligence and inquisitive nature.

Social dynamics within the group may shift during this period. Juvenile degus begin to establish their positions within the colony's hierarchy, and this process can involve chasing, mounting, vocalizing, and occasional brief scuffles. These interactions are usually harmless and resolve quickly, but it is important to monitor for signs of serious aggression such as bite wounds, persistent bullying, or one animal being consistently excluded from food, water, or sleeping areas.

Vocalizations become more varied and frequent during adolescence. Degus have one of the most complex vocal repertoires of any rodent species, with researchers having documented over fifteen distinct call types. Juvenile degus practice and refine these calls as they interact with cage mates, responding to alarm calls, greeting chirps, and contact calls. Learning to recognize your degu's vocalizations can help you understand its emotional state and identify potential problems early.

Some juvenile degus may go through a period of increased wariness around humans, particularly if handling was inconsistent during the neonatal period. Patience and regular, gentle interaction are the best remedies. Offer treats from your hand, speak softly, and allow the degu to approach you on its own terms. Forcing interaction will only reinforce fear and slow the taming process.

Degus are remarkably intelligent and respond well to positive reinforcement training during the juvenile period. They can learn to come when called, navigate simple mazes, and even use exercise wheels and running saucers with enthusiasm. Training sessions should be short—five minutes or less—and always end on a positive note with a small, low-sugar treat such as a sunflower seed or a tiny piece of rolled oat.

Environmental enrichment is not optional for degus; it is a fundamental requirement for their mental health. A stimulating cage setup should include multiple levels connected by ramps or branches, tunnels made from safe materials, digging boxes filled with coconut fiber or sterilized sand, and a variety of chew toys that are rotated regularly to maintain novelty. Degus that lack mental stimulation are prone to repetitive behaviors such as bar chewing and cage circling.

Dust bathing is an essential form of both hygiene and enrichment for juvenile degus. Provide a dust bath using chinchilla-grade volcanic dust in a shallow container several times per week. Degus roll and flip in the dust with obvious enjoyment, and the process removes excess oils from their coat, keeping it clean and healthy. Remove the dust bath after about twenty minutes to prevent it from being used as a litter area.

Exercise wheels and running saucers are excellent additions to the cage, but they must be chosen carefully. The wheel should be solid-surfaced with no rungs or mesh that could catch toes or tails, and it should be large enough—at least twelve inches in diameter—to allow the degu to run without arching its back. Many degus will run for extended periods, particularly during dawn and dusk when they are naturally most active.

Juvenile degus are extraordinarily active animals that require ample space and opportunity for physical exercise. In the wild, degus cover significant distances foraging for food, and captive degus retain this drive for movement. A spacious multi-level cage is essential, with a minimum recommended size of 24 by 24 by 24 inches for a pair, though larger is always better. Vertical space is just as important as floor space, as degus are agile climbers.

Supervised out-of-cage playtime in a degu-proofed room provides valuable exercise and mental stimulation. Before allowing free roam, carefully inspect the area for electrical cords, toxic houseplants, small openings where a degu could escape, and any items that could be chewed and ingested. Degus are prolific chewers and can cause significant damage to furniture, baseboards, and wiring in a surprisingly short time.

During out-of-cage sessions, provide climbing structures, tunnels, and foraging opportunities to keep the degus engaged. Scatter a small amount of hay or safe herbs around the play area to encourage natural foraging behavior. Always supervise these sessions closely, as degus are fast, agile, and remarkably good at finding hiding spots that are difficult for humans to access.

Pay attention to the time of day when you schedule exercise. Degus are diurnal, meaning they are most active during daylight hours, with peaks of activity in the early morning and late afternoon. Attempting to engage them during the evening or night, when they naturally rest, will result in reluctant and sluggish animals. Aligning playtime with their natural rhythms ensures maximum benefit and enjoyment for both you and your degus.

Degus reach sexual maturity at a surprisingly young age, often as early as six to eight weeks, though full reproductive maturity typically occurs between three and six months. Because of this early onset, separating males and females by six weeks of age is critical if you do not intend to breed. Siblings will breed readily, and an unplanned pregnancy in a very young female can carry significant health risks.

Spaying and neutering degus is technically possible but carries higher risk than in more commonly treated species. Degus are small animals, and any procedure requiring general anesthesia presents an elevated risk. Additionally, very few veterinarians have extensive experience performing these surgeries on degus specifically. If you are considering surgical sterilization, seek out an exotics veterinarian who has performed the procedure on degus or closely related species multiple times.

For most degu owners, the practical alternative to surgical sterilization is maintaining same-sex groups. Degus thrive in social settings, and pairs or small groups of the same sex generally coexist well, particularly if they were raised together from a young age. Introducing unfamiliar adults requires careful, gradual bonding procedures and is not always successful.

If you choose to keep a mixed-sex group without sterilization, be prepared for the reality that breeding will occur. Degus can produce multiple litters per year, and each litter may contain up to twelve pups. Before allowing any breeding, ensure you have the resources, space, and commitment to care for the offspring or have confirmed homes arranged in advance.

The juvenile period is a defining time for a degu's social development. Degus are obligate social animals, meaning they suffer both psychologically and physically when housed alone. A solitary degu is at significantly higher risk for depression, self-harming behaviors such as excessive barbering, and even a shortened lifespan. Keeping at least two degus together is considered a minimum standard of care.

Within a group, juvenile degus spend considerable time establishing and reinforcing social bonds. Mutual grooming is one of the most important bonding behaviors, and you will frequently see cage mates grooming each other's faces, heads, and backs. This behavior reduces stress, strengthens pair bonds, and helps maintain coat condition. A degu that is consistently excluded from grooming interactions may be experiencing social rejection and should be monitored closely.

Introducing a new degu to an existing group during the juvenile period is generally more successful than attempting introductions with fully mature adults. The process should still be gradual, beginning with cages placed side by side so the animals can smell and hear each other without physical contact. After several days of proximity without signs of aggression, supervised meetings in a neutral space can begin. Full integration may take one to three weeks depending on the temperaments of the individuals involved.

Human socialization should continue to deepen during this stage. Spend time near the cage talking, reading aloud, or simply being present so the degus grow accustomed to your voice and movements. Offering treats by hand during these sessions builds trust and positive associations. Juvenile degus that receive consistent, gentle human interaction develop into confident, handleable adults that are a joy to interact with for years to come.