In addition to being an interesting and unusual story it turns out that most of the people named are related - and are already mentioned on this site.
Ralph Norman Thrale (1803-1876) and William Thrale (1805-1876) were brothers, the sons of Ralph Thrale (1778-1852) and Sarah Burchmore (1767-1820) - see Who is related to Who. Their sister was Harriet Thrale (1801-1879) who married James Mardall (1784-1844). The Thrale Family is well documented in the books A New Thraliana and A Newer Thraliana. The stuffed panther was the prize exhibit in the museum at their farm at No Mans Land. The Mardall family owned the Harpenden Brewery.
The Mr House whose dog was killed may have been John Isaac House (1793-1849) whose wife Ann Kidman (1792-1859) was aunt to Alfred James Elliott Kidman (1831-1875) who appears in a different part of the Who is related to Who tree.
Isaac Field (born c1813) was, in 1841, an agricultural labourer living with his wife Mary at Gustard Wood, Wheathampstead.
The name "William Smith" was too common to make a reliable identification from the 1841 census.