one man and his dog

Saw three men walking together, one with a dog.
Two friends walk ahead, then shout 'come on Nasher!'(or something like...).
Dog takes off at high speed towards the call.
Man on end of the lead, cider can in hand, is helplessly dragged along, at dog's pace.
All three men fall about laughing, especially when I take photo as one man and his dog speeds past me....