Big, busy events like Burghley Horse trials for instance.
Went there today but left my dogs at home. There were loads of unhappy dogs there. It was hot, it was crowded. People were dragging poor dogs into the shops, they were walking all round the XC course in the heat, they were sitting in amongst legs and getting trodden on. 2 had obviously had enought and started a fight!
Why do people take them? I'm pretty sure my 2 were far happier at home in the cool house, sleeping the day away.