There was a post that either I or someone else started some time ago, but i used this chart when i took Kenya to the vet....
But yes, its always good to show examples, so look online and bring in pictures. Ive seen both mistakes happen crop ended up too small or too long... luckily my vet was kick ass and i got exactly what i wanted lol..
Also, dont fret if the ears flop or are acting funny after the crop. it took kenya a lil while to learn how to hold her ears lol.... its those funny puppy stages lol
cute pup btw!