Brewster:
Brewster Record of Intentions of Marriage from 1829-1846.
Besides marriage intentions, this book records marriages ca 1829-1843, deeds/bills of sale ca 1829-1845, and about 65 pages of dog registrations from 1859-1889 on fiche 21.

Groton:
Groton Dog Registrations [1858-1869]. About 50 pages. [0034], Fiche 108.

Hancock:      sample
Hancock Book of Marriages, Births & Deaths 1832-1844. Book 2.
Note that marriage intentions and dog registrations continue through 1893.
Dog Registrations 1868-1893, Fiches 3-4.

Nantucket:
Nantucket Dog Licenses 1853-1885, Births 1842-1843, Fiches 217-219.