Harry, 11, was drawn at random from hundreds of entries to help assist the reconstruction of Dippy following his move from the Natural History Museum in London.
Harry Swift placed the final 292nd bone on the foot of Dippy the Diplodocus when it was unveiled at Dorset County Museum on February 8.
Dippy the Diplodocus, the replica dinosaur skeleton that had greeted visitors in the entrance hall of London's Natural History Museum from 1905 to 2017, has embarked on a tour of the United Kingdom.
The cast, which is made from plaster of Paris and resin, is an example of the Diplodocus carnegii species that lived between 145 and 156 million years ago and roamed North America.
In its displayed pose, the skeleton is 26 metres long, 4.3 metres wide and 4.17 metres high.
First stop for the skeleton, one of ten casts taken from a 150-million-year-old fossil found in 1898 in Wyoming, was Dorset County Museum in Dorchester.
In place of the dinosaur, a blue whale skeleton is now displayed in the Hintze Hall.
"Tickets to visit Dippy are being booked up fast, so we are encouraging everyone who hasn't done so already, to reserve their tickets soon to avoid missing out".
Dippy will be on display in Dorchester for three months before being shown at museums and cathedrals in Birmingham, Belfast, Glasgow, Newcastle, Cardiff, Rochdale and Norwich.
The Natural History Museum says it hopes the tour by the iconic skeleton, which has never been seen outside the London museum, will encourage visitors to "explore nature on their doorstep", with each host museum using the opportunity afforded by their illustrious dino guest to promote their own natural history collections.