Hamster Lifespan: How Long Do Hamsters Live?

Most pet hamsters live between 18 months and 3 years, according to the Merck Veterinary Manual. The RSPCA says hamsters usually live for up to two years, although some may live for longer. The type matters. Merck's table gives 18 to 24 months for a Russian dwarf hamster and 36 to 48 months for a Roborovski. In a study of UK vet clinic records, the median age at death was 1.75 years. Each type below has its number with the source that states it.

Average Hamster Lifespan

Merck's pet page also gives one range for all pet hamsters together, and the RSPCA's "up to two years" falls inside it. A laboratory animal chapter, linked in the Chinese hamster section below, puts the Syrian average at 2 years, with the potential for aging up to 3 years.

What Vet Records Show

A lifespan range says how long a hamster can live. Vet records show how long hamsters did live. The Royal Veterinary College's VetCompass study, published in the Journal of Small Animal Practice in 2022, looked at records from UK vet practices for 16,605 hamsters. The authors reviewed a random 3,998 of them in detail. Among 1,055 hamsters that had died and had an age on record, the median age at death was 1.75 years. A quarter died at 0.83 years (about 10 months) or younger, and the oldest was 3.65 years.

The median did not differ between Syrians (1.76 years) and the other types combined (1.68 years). Males had a median of 2.00 years and females 1.67 years. These are hamsters that died under veterinary care, so the figures describe pet hamsters that reached a vet, not every hamster.

Wet tail, the name for diarrhea in hamsters, was the most common cause of death at a precise level, at 7.88 percent of deaths with a recorded cause, followed by abdominal mass (6.40 percent) and neoplasia (5.38 percent). Hamsters that died of wet tail had a median age of 0.34 years, about 4 months, while those that died of a skin neoplasm had a median of 2.11 years. Deaths at a young age are counted in the 1.75-year median.

Dwarf Hamster Lifespan

Merck calls most pet hamsters other than the Syrian dwarf hamsters. It gives 18 to 24 months for the Russian dwarf and 36 to 48 months for the Roborovski, so there is no single dwarf figure. The VetCompass authors add that earlier ages at death of 0.75 to 1.25 years have been reported for some dwarf species in laboratory settings.

Tumors are one reason to watch an older dwarf closely. Merck's professional manual says Djungarian hamsters show neoplasia at 5 times the rate of Syrian hamsters, and that most of their tumors are of the skin. The RSPCA says tumours are not uncommon in hamsters, especially along the underside of the abdomen. The RSPCA says hamsters "don't show outward signs of pain, so may suffer before you realise."

Merck lists scruffy hair or hair loss among the signs of a sick hamster, together with inactivity, loss of appetite or weight, a hunched back, diarrhea, and trouble breathing. Our page on hamster fur loss covers the causes.

Syrian Hamster Lifespan

Merck gives the Syrian 18 to 36 months in its pet table and 2 to 3 years in its professional chapter. The VetCompass median age at death for Syrians was 1.76 years.

Merck's professional manual describes what happens to aging Syrians. Atrial thrombosis, a blood clot in the heart, occurs in aging Syrian hamsters with an incidence of up to 70 percent, and on average at a younger age in females (13.5 months) than in males (21.5 months). Weight loss in older Syrians is often linked to amyloidosis, a build-up of abnormal protein in the liver and kidneys. Merck says amyloidosis is infrequently reported in pet Syrians.

Young Syrians face a different risk. Merck says wet tail is the name for diarrhea in Syrians and is used mostly for the disease in young hamsters. It says proliferative ileitis is the most consequential intestinal disease of Syrians 3 to 10 weeks old and results in high mortality.

In the wild, Syrian hamsters are omnivores that eat seeds, nuts, and insects, according to Syrian diet essentials. Merck says a pet hamster should get a complete, balanced, pelleted diet made for hamsters, and that generic seed mixes should be avoided because hamsters pick out the seeds and ignore the pellets. For help choosing pellets, see our guide on getting the best hamster food.

Winter White Dwarf Hamster Lifespan

No veterinary or welfare page read for this guide gives a separate lifespan for the winter white. The Merck Veterinary Manual gives 18 to 24 months for Russian dwarf hamsters, but it does not say which species that name covers, and the sources use several names for these hamsters. The Mammal Diversity Database lists "Russian Winter White Dwarf Hamster" and "Siberian Dwarf Hamster" as other names for Cricetiscus sungorus. The laboratory animal chapter names Phodopus campbelli as the Russian dwarf and Phodopus sungorus as the Siberian dwarf. The RSPCA lists the Campbell's Russian dwarf and the winter white dwarf as two of the five types most commonly kept as pets.

The winter white takes its name from its coat. The laboratory animal chapter says P. sungorus molts to a pure white coat in a short photoperiod, meaning short winter days, while P. campbelli keeps its gray coat.

In the VetCompass records, 13.77 percent of the hamsters were Djungarian (winter white dwarf), the second most common type after the Syrian at 73.45 percent.

Teddy Bear Hamster Lifespan

A teddy bear hamster is a Syrian with a long coat. Merck's professional manual says longhaired Syrians are also known as "teddy bear" hamsters, so the Syrian numbers above apply to it: 18 to 36 months in the pet table and 2 to 3 years in the professional chapter. The RSPCA adds that some long-haired varieties may need weekly brushing to remove matts, bedding, and debris from the fur.

The cage matters for any Syrian. The RSPCA says to use a solid cage floor, because wire mesh floors can lead to foot problems, and to avoid cotton wool or other fluffy bedding made of thin strands. It says these can tangle around a hamster's limbs and cut off circulation. A bedding guide on The Dodo lists options that are safe for burrowing and nesting, and it quotes a hamster advocate who says to avoid anything scented, pine, cedar, or unlabelled shavings.

Roborovski Dwarf Hamster Lifespan

The Roborovski has the longest lifespan in Merck's table, 36 to 48 months. The Spruce Pets has a guide to how a Roborovski is properly cared for, written by Lianne McLeod, DVM, and it gives a lifespan of 2 to 4 years in captivity. The two sources overlap between 3 and 4 years and differ at the low end.

The same guide recommends an enclosure at least 2 feet long, 1 foot wide, and 1 foot high, with a solid-surface wheel instead of a barred one. On company, the RSPCA says dwarf hamsters can live together with the right care and conditions. The California Hamster Association's article on dwarf hamsters describes a degree of sociability in the Phodopus species and says Roborovskis do best in female pairs.

PetMD, in an article by Melissa Witherell, DVM, says a wheel should be at least 6 inches across for a dwarf hamster and at least 8 inches for a Syrian, and that a wheel that is too small can injure a hamster. It says that enrichment can help prevent anxiety, obesity, and restlessness. It says plastic running wheels with small ridges or a textured surface have been shown to cause the least injuries. Our page on tunnels for hamsters lists tunnel options.

Chinese Hamster Lifespan

Merck gives the Chinese hamster 24 to 36 months. The laboratory animal chapter gives an average normal life span of 2.5 to 3.0 years under laboratory conditions. The RSPCA says Syrian and Chinese hamsters are better kept on their own.

The same chapter, titled "Biology and Diseases of Hamsters," covers common hamster diseases. It notes that spontaneous hereditary diabetes mellitus has been described in the Chinese hamster, in inbred laboratory lines.

What Care Can Change

No source used here puts a number of extra months on any care step. What they describe is what keeps a hamster from getting sick or hurt.

Temperature is one. The RSPCA says hamsters should live indoors, with no draughts or damp, because the cold can send them into torpor, a hibernation-like state that is dangerous for a hamster with little body fat. Merck says hamsters often hibernate below 5 degrees C (41 degrees F), and that Syrians will starve if they do not wake up to eat.

Escape is another. Merck says one of the most important safety steps is preventing escape, because many hamsters are badly hurt after getting out of their cages. In the VetCompass records, traumatic injury was the most common group of disorders, found in 15.41 percent of the 3,998 hamsters reviewed, and bite injuries from other hamsters were recorded in 5.88 percent.

Teeth need chewing. Merck says a hamster's front teeth grow continuously and that safe chew toys, such as small wooden blocks, help wear them down. The RSPCA says to check the front teeth regularly, because if one incisor is damaged the other can keep growing and may eventually stop the hamster eating.

Regular veterinary check-ups begin with a first visit soon after you bring a hamster home, according to the MSD Veterinary Manual, which says that visit can help a vet find health problems early. It also says no vaccines are required or recommended for hamsters. For what keeping a hamster costs, see the costs of having a pet hamster.

Our page on how long a hamster can go without food covers what the sources say about hunger and torpor. Our page on the difference between male and female hamsters covers sex and housing, and our guide to 5 rare hamster breeds covers what each of the rarer hamsters really is.

READ NEXT: 5 Best Hamster Breeds for Kids

Sources

• Merck Veterinary Manual. "Description and Physical Characteristics of Hamsters" (pet version). merckvetmanual.com.
• Merck Veterinary Manual. "Hamsters" (professional version). merckvetmanual.com.
• MSD Veterinary Manual. "Routine Health Care of Hamsters." msdvetmanual.com.
• RSPCA. "Hamsters," with the environment, diet, and health pages. rspca.org.uk.
• O'Neill, D. G., et al. "Demography, disorders and mortality of pet hamsters under primary veterinary care in the United Kingdom in 2016." Journal of Small Animal Practice, 2022. pubmed.ncbi.nlm.nih.gov.
• Miedel, E. L., and Hankenson, F. C. "Biology and Diseases of Hamsters." Laboratory Animal Medicine, 2015. ncbi.nlm.nih.gov.
• McLeod, Lianne, DVM. "How to Care for a Pet Robo (Roborovski) Hamster." The Spruce Pets. thesprucepets.com.
• Witherell, Melissa, DVM. "Hamster Wheels." PetMD. petmd.com.
• Mammal Diversity Database. Cricetiscus sungorus.
• California Hamster Association. "Cohabitating Dwarf Hamsters: An Examination of Research and Opinion." californiahamsterassociation.com.
• The Dodo. "Hamster Bedding: The 6 Best Options That Are Safe And Burrow-Friendly." thedodo.com.
• Animalia. "Syrian Hamster." animalia.bio.