Are Roof Rats Legal in Wisconsin? Keeping, Breeding & Selling

Keeping / owning   Legal

Confidence: High · Last verified 2026-06-10

Rattus rattus is a non-native wild animal that is not endangered and not a designated ‘harmful wild animal’, so it is statutorily exempt from any DNR possession license (Wis. Stat. 169.04(4)(b); the harmful-wild-animal list, 169.11(1)(a), names only cougars, bears, and wild/feral swine). No permit, testing, or inspection by the DNR. Note: municipalities may impose stricter local exotic-pet rules (169.11(3)).

Sources: Wisconsin Legislature / DNR, Wisconsin DNR

Breeding   Legal

Confidence: High · Last verified 2026-06-10

Propagation is tied to the possession exemption: Wis. Stat. 169.08(2) exempts from the Captive Wild Animal Farm License any animal exempt under 169.04(4)(b). So hobby and commercial breeding of roof rats need no DNR breeding permit, inspection, or fee (and the NR 16.30 caging standards apply only to ch.169-licensed animals, so they do not bind roof-rat keepers).

Sources: Wisconsin Legislature / DNR

Selling or giving away   Unregulated / unclear

Confidence: Low · Last verified 2026-06-10

The DNR requires no sales license (169.10(1)(b), via the same exemption). BUT commercial selling may trigger a DATCP Animal Dealer license ($220/yr; Wis. Stat. 95.69, ATCP 12.03) IF DATCP classifies R. rattus as a ‘wild animal’ rather than a ‘domestic animal’ (ATCP 10.02(8)). DATCP’s pet-movement guidance lists the ‘domestic rat’ as a household pet, but it is unconfirmed whether that covers R. rattus or only R. norvegicus. Giving away privately is unproblematic; commercial sale is the gray zone.

Sources: Wisconsin Legislature / DNR

Transport & import   Legal with a permit

Confidence: Medium · Last verified 2026-06-10

Intrastate movement of a healthy pet is unregulated. IMPORT into Wisconsin requires a Certificate of Veterinary Inspection for every animal (ATCP 10.06(1)), no rabies/test requirement for rodents, and MAY additionally require a Wild Animal Import Permit (ATCP 10.84) if DATCP treats R. rattus as a ‘wild animal’ rather than ‘domestic’. Never release a roof rat.

Sources: Wisconsin DATCP, Wisconsin DNR

Where: Wisconsin DATCP, Division of Animal Industry

Source: Wisconsin DATCP

Source: Wisconsin Legislature / DNR

Keeping and breeding roof rats in Wisconsin are legal (the DNR exempts non-native, non-harmful animals). The commercial sale and import sit in a gray zone. The agriculture department (DATCP) regulates dealers and importers of ‘wild animals’ while exempting ‘domestic’ ones, and it is unconfirmed whether DATCP’s ‘domestic rat’ covers captive-bred Rattus rattus or only the fancy rat (R. norvegicus).

The ask: Ask DATCP’s Division of Animal Health to confirm in writing that a captive-bred, domesticated Rattus rattus is a ‘domestic animal’ under ATCP 10.02(8), so that selling it needs no $220 Animal Dealer license (ATCP 12) and importing it needs only a Certificate of Veterinary Inspection, not a Wild Animal Import Permit (ATCP 10.84). On the domestic-versus-wild question, the line drawn for the pets DATCP already treats as domestic turns on domestication, not wild ancestry. The dog descends from the wolf and the cat from a wild felid, yet both are domestic animals because of generations bred for tameness. The already-exempt fancy rat is itself the wild brown rat (R. norvegicus), domesticated only in the 19th century, so a captive-bred R. rattus is the same case one species over. The question for DATCP is whether a captive-bred R. rattus is domesticated in that same sense as the fancy rat it already lists as a household pet, a determination for the Division to make. On domestication background, see https://blonderoofrat.com/how-the-sewer-rat-became-the-fancy-rat/ .

Where the lever really is: This is an agency clarification case, not a law-as-written one. The rules already exempt ‘domestic’ animals; the only open question is whether DATCP reads ‘domestic rat’ to include R. rattus. The lever is a written determination from DATCP, not the legislature.

Where to send it (more than one channel helps):

• Wisconsin DATCP, Division of Animal Health (executive / agency), official contact page
  DATCP decides whether R. rattus is ‘domestic’ (ATCP 10.02(8)) for Animal Dealer-license and import-permit purposes. Reach the Division of Animal Health via its Animal Imports / Movement contact on datcp.wi.gov.

A starting-point message, please put it in your own words; a short personal note carries far more weight than an identical form letter:

To the Wisconsin DATCP, Division of Animal Health,

I keep and, on a small scale, breed domesticated roof rats (Rattus rattus) as pets. Wisconsin's DNR exempts them from wildlife licensing as non-native, non-harmful animals. I am writing to confirm how DATCP classifies them for commercial and import purposes.

Specifically: is a captive-bred, domesticated Rattus rattus a "domestic animal" under ATCP 10.02(8) (like the domestic rat or mouse in your pet-movement guidance), so that (a) selling them does not require an Animal Dealer license under ATCP 12, and (b) importing one requires only a Certificate of Veterinary Inspection, not a Wild Animal Import Permit under ATCP 10.84?

If the question turns on wild ancestry, the dog descends from the wolf and the cat from a wild felid, yet both are recognized as domestic animals, because what makes an animal domestic is generations bred for tameness, not the wild origin of its species. The fancy rat is itself the wild brown rat (R. norvegicus), domesticated only in the 19th century, so a captive-bred R. rattus is the same case one species over. I ask only whether a captive-bred R. rattus is domesticated in that same sense as the fancy rat the Division already treats as a domestic pet; the determination is the Division's to make.

These animals are captive-bred over generations for tameness, kept indoors, and never released. A written confirmation I can rely on would be appreciated.

Thank you,
[Your name]

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