Simply indicate the names on the form. If you register it to Jane and John, then both persons have to sign for every future work you want done. If you register to Jane or John, then either one can sign for future work.
How do I register a dog in the name of more than one owner?
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as of Nov 2020
State/Prov. Amount Alberta $ 930 Alaska $ 378 Alabama $3,172 Arkansas $1,676 Arizona $1,886 British Columbia $ 317 California $2,399 Colorado $1,578 Connecticut $ 815 Dist. of Columbia $ 2 Delaware $ 92 Florida $1,597 Georgia $1,962 Hawaii $ 5 Iowa $2,069 Idaho $ 888 Illinois $ 992 Indiana $4,467 Kansas $4,173 Kentucky $ 844 Louisiana $4,801 Massachusetts $1,333 Manitoba $ 364 Maryland $ 476 Maine $1,558 Michigan $2,852 Minnesota $ 774 Missouri $1,658 Mississippi $1,250 Montana $1,312 New Brunswick $ 95 North Carolina $1,839 North Dakota $ 635 Nebraska $1,974 New Hampshire $1,014 New Jersey $1,756 New Mexico $1,153 Nova Scotia $ 28 Nevada $1,193 New York $ 748 Ohio $5,216 Oklahoma $1,933 Ontario $1,331 Oregon $2,508 Pennsylvania $4,340 Puerto Rico $ 38 Quebec $1,223 Rhode Island $ 205 South Carolina $2,048 South Dakota $ 225 Saskatchewan $ 646 Tennessee $1,971 Texas $6,085 Utah $ 944 Virginia $2,558 Vermont $ 463 Washington $1,868 Wisconsin $ 999 West Virginia $2,644 Wyoming $1,022