A rough standard is the english bull terrier x australian blue heeler,and a good pair of dogs will stop a bull no matter how much fight he has in him,a bull gets a bit sick of a dog hanging off his nose too after a while even though he might have given that dog a good rubbing they generally stick like shit to a blanket.After that get your rope on the bull and do what you like to him.

"when a kudu is hit 10km from camp at dusk, it is a little late to think about using a dog."

Thats exactly when the dog comes into his own,a native tracker cant see too well in the twilight/dark of course whereas a dog can "see" through his nose as well,a dog is unbeatable as a tracker and if a steady dog is along for the hunt to be called apon at any time your results surely go up,dosent matter if its a quail or kudu a dog will find better than any of us.