> I dunno why they would but they might.
In my breed it used to be common to enter more than one class. In the past ti was common in all breeds especially when there was prize money in classes. This is especially true at Breed Club shows where more classes are laid on.
Fro example suppose you entered a 10 month old pup in Puppy Junior and Novice, and got 1st, in one 2nd in the other and even third in the last. When you entered the show the first class cost the most and the next classes entered with same dog were nominal.
I don't know what percentage of the entry went into prize money, but it could mean if you had a good day you would get most of your fee back.
Nowadays, especially as in my breed when entries are low especially in the age classes someone may be happy to win 1st out of a small number, or fancy their chances against older/more experienced competition.
I would be more satisfied with 2nd in a class with more dogs than the 1st in a class of one or two.
Some people prefer to win one class and go into the unbeaten dogs challenge at the end, saying that if they then got second in the next class they entered they couldn't' go in the challenge for Best of Sex, but if they didn't win the other class it means the judge would not likely have considered them for the top award anyway.
In 2001 at our breed club show I entered my 17 month old Jozi in Junior, Special Yearling, Graduate, Post Graduate, and Special Beginners. She won all five, so when we got called in with all unbeaten dogs instead of some 13 bitches to go against there were just five! She won Best bitch and Reserve Best In show.
Another reason for entering more classes is the Junior Warrant. Points are only allocated to first place in classes with three or more exhibits.
I have two Junior warrant winners,a nd have never got a point in Puppy and rarely in Junior, so when I realised I had a good chance with a good exhibit I entered first two then three classes, usually only getting points from the higher classes.
When I was trying with my first champion the rules wanted 10 points won by winning 10 classes at Open shows, we never had enough dogs at all at that level, and pups rarely go BOB, My Jozi had more than enough class wins, but not enough with three in the class at Opens. There are far fewer JW winners in my breed than champions.