It is better not to be crunchy as that can be heard by neighbouring dogs & put them off(big no no)LOL we often use an empty crisp packet in pocket to make noises with but the best situation is always when somebody in front of you are feeding their dog very obviously and noisily as that way the dog's ears will go up!! We always try to be behind somebody for that reason.
I have one dog that ONLY will show for Mariner's Choice or Fish 4 Dogs treats which is a bit of a pain as they are huge and takes forever to chew, but it's what works. The judge can wait, we PAY to be there!! She will even spit sausages out. Have another who hates anything chicken, you can give her a bowl full of mixed raw meat and she will eat everything BUT the chicken.
The Papillons are tiny so tend to get sliced ham and similar.