Davis Gun firing demonstration news reel clip

On the British Pathe news reel site, there is a very short news reel segment, vintage late WW1 or shortly thereafter, showing the demonstration firing of 2 Pdr (?) and 6 Pdr (?) Davis guns.

The 2 Pdr (?) is fired from the shoulder at the end of the segment.

Below the news reel video segment are still shots taken from the news reel footage.

See here: britishpathe.com/video/wonderful-new-guns


Did artillery crews usually have a dog mascot?

In the second part did you notice that the person delivering the powder had a cigarette in his mouth ???

Thank you
I really enjoyed watching that clip