{"topic_id":"exotic_husbandry_rat_mouse","category":"exotic-pet-husbandry","context":"---\ntopic_id: exotic_husbandry_rat_mouse\ncategory: exotic-pet-husbandry\ntitle: \"Husbandry of rats and mice (Merck): caging, substrate, social needs\"\nlang: en\nsource: \"Merck Veterinary Manual — Mice and Rats as Pets (first-hand server-rendered HTML, stripped to text; retrieved 2026-07-29 via curl -A Mozilla/5.0)\"\nsource_file: pdf-raw/merck/rodents_rats_mice.txt\nsource_type: veterinary_reference\ndate_parsed: 2026-07-29\ntokens_estimated: 165\nverification: C1_substring_match\nclaims: 3\nsource_document: \"Merck Veterinary Manual, Mice and Rats as Pets\"\ncitation:\n  authority: \"Merck Veterinary Manual\"\n  title: \"Husbandry of rats and mice (Merck): caging, substrate, social needs\"\n  url: \"https://www.merckvetmanual.com/exotic-and-laboratory-animals/rodents/mice-and-rats-as-pets\"\n  retrieved: \"2026-07-29\"\n  ref: \"Merck Veterinary Manual (first-hand HTML, stripped to .txt)\"\n  doc_type: \"professional veterinary reference (first-hand English text)\"\n  needs_review: false\n---\n\n# Husbandry of rats and mice (Merck): caging, substrate, social needs\nSource: Merck Veterinary Manual article \"Mice and Rats as Pets\" (first-hand, retrieved 2026-07-29 via curl, HTML stripped to plain text). All bullets are exact verbatim substrings of the cited source_file and C1-substring verified.\n\n## Housing and socialization for pet rats and mice\n- `The best cages for pet mice and rats are made of a material that is easy to clean and deodorize and that is indestructible to rodent chewing or digging in the corners.`\n- `Wire-mesh floors should be avoided because rats and mice can trap their feet, and especially hindlimbs, in the openings, resulting in fractures and injuries.`\n- `Rats are social animals, and grooming is a socially affiliative behavior. If left alone without human contact and environmental enrichment, singly housed rats might develop isolated-rat stress syndrome, which includes signs such as increased startle reflex and elevated basal levels of stress hormones ( 6 ).`\n> Husbandry of Mice and Rats The best cages for pet mice and rats are made of a material that is easy to clean and deodorize and that is indestructible to rodent chewing or digging in the corners.\n> Wire-mesh floors should be avoided because rats and mice can trap their feet, and especially hindlimbs, in the openings, resulting in fractures and injuries.\n> Pet owners generally choose bedding on the basis of cost and availability; laboratory veterinarians choose bedding on the basis of cost and water-holding capacity.\n> This type of bedding irritates pet rodents, and the coloring agents can stain the coat of white rats or mice.\n> Historically, owners of pet rats or mice preferred paper and softwood chips, such as kiln-dried pine or aspen, over straw because it requires fewer bedding changes.\n> Wood chip bedding (such as pine and aspen) that has not been heat treated should not be used, because it contains volatile chemicals that can irritate the respiratory tract and activate liver enzymes in rodents ( 1 , 2 ).\n> Owners must combine frequent bedding changes with good husbandry practices, such as regular cage cleaning, low animal density, and low environmental temperature and humidity.\n> Aquariums are not suitable cages for rats and mice, because air circulation is inadequate and therefore ammonia builds up.\n> Pearls & Pitfalls Aquariums are not suitable cages for rats and mice, because air circulation is inadequate and therefore ammonia builds up.\n> Environmental temperature and relative humidity can depend on husbandry and housing design and can differ considerably between the cage and the room the cage is in.\n> Factors that contribute to variation in temperature and humidity include cage material and construction, number of animals in the cage, frequency of bedding changes, and bedding type.\n> The main factors that determine the type of bedding material for pet mice and rats are size and manipulability.\n> Mice and rats avoid bedding consisting of small particles; they prefer bedding consisting of large, fibrous particles.\n> Mice and rats are optimally maintained at temperatures of 18–26°C (64–79°F).\n- `Husbandry of Mice and Rats The best cages for pet mice and rats are made of a material that is easy to clean and deodorize and that is indestructible to rodent chewing or digging in the corners.`\n- `Wire-mesh floors should be avoided because rats and mice can trap their feet, and especially hindlimbs, in the openings, resulting in fractures and injuries.`\n- `Pet owners generally choose bedding on the basis of cost and availability; laboratory veterinarians choose bedding on the basis of cost and water-holding capacity.`\n- `This type of bedding irritates pet rodents, and the coloring agents can stain the coat of white rats or mice.`\n- `Historically, owners of pet rats or mice preferred paper and softwood chips, such as kiln-dried pine or aspen, over straw because it requires fewer bedding changes.`\n- `Wood chip bedding (such as pine and aspen) that has not been heat treated should not be used, because it contains volatile chemicals that can irritate the respiratory tract and activate liver enzymes in rodents ( 1 , 2 ).`\n- `Owners must combine frequent bedding changes with good husbandry practices, such as regular cage cleaning, low animal density, and low environmental temperature and humidity.`\n- `Aquariums are not suitable cages for rats and mice, because air circulation is inadequate and therefore ammonia builds up.`\n- `Pearls & Pitfalls Aquariums are not suitable cages for rats and mice, because air circulation is inadequate and therefore ammonia builds up.`\n- `Environmental temperature and relative humidity can depend on husbandry and housing design and can differ considerably between the cage and the room the cage is in.`\n- `Factors that contribute to variation in temperature and humidity include cage material and construction, number of animals in the cage, frequency of bedding changes, and bedding type.`\n- `The main factors that determine the type of bedding material for pet mice and rats are size and manipulability.`\n- `Mice and rats avoid bedding consisting of small particles; they prefer bedding consisting of large, fibrous particles.`\n- `Mice and rats are optimally maintained at temperatures of 18–26°C (64–79°F).`\n","sources":["exotic-pet-husbandry — Husbandry of rats and mice (Merck): caging, substrate, social needs (retrieved 2026-07-29)"],"source":{"authority":"exotic-pet-husbandry","title":"Husbandry of rats and mice (Merck): caging, substrate, social needs","url":"https://www.merckvetmanual.com/exotic-and-laboratory-animals/rodents/mice-and-rats-as-pets","retrieved":"2026-07-29","ref":"","doc_type":"official PDF","source_document":"Merck Veterinary Manual, Mice and Rats as Pets","verification_file":"pdf-raw/merck/rodents_rats_mice.txt"},"source_document":"Merck Veterinary Manual, Mice and Rats as Pets","source_file":"pdf-raw/merck/rodents_rats_mice.txt","tokens_estimated":165,"generated_at":null,"tip":"Use /api/v1/topics to discover more topics. /api/v1/nutrient for precise single-point queries. /api/v1/cross_compare for 2-3 standard comparisons."}