Dave - the "sugar" is kept in the boot, mostly for COL meets and the shooting season - we set off from the house for each drive so it's always close to hand
I've only seen 1 dog get wobbly on the shoot, it was late morning and a very active springer - she had a teaspoon of honey and was rested for the afternoon - all good after.
It was my Uncles suggestion to keep something sugary to hand as his springer has had a problem while working and the shoot organiser has fudge for the same reason.
It's been a fair few years since I walked a Munro but 3 in a day and 15 miles+ wasn't unusual
stunning scenery and nothing beats tea and a marmalade sandwich at the top
The risk of Miss P running out of steam is very low
the most we do now is a gentle 8 miles in woodland
I've not come across pemmican but will look it up, thanks