What is the fine-grained topic of the following text: on Saturday, with excellent handling by Amy Kiefer, Ch Heiko von den Donau-Wibeln of Ambelagi won BOB and first in Champions Class on Saturday under judge Mrs Nellie Abela (Australia) and on Sunday, even with the hustle and bustle, pushing and shoving, showed beautifully and passed his Canine Good Citizen Bronze without training specifically for it. Only return the topic.
Dog show performance and achievement of Ch Heiko von den Donau-Wibeln.