I`me surprised how many people Don't.!!!!
And i`ve seen a few quite injuries when out with lurchers and terriers... I always have one in my van, nowt special, just the usual bandage, cleansing wipes, dressings, plasters, wound spray, vet wrap, and always have a bottle of water in the van too, and that's for drinking or cleaning....
"Well Done" to your mate for caring enough about his dog to be prepared...
Yis Mars...