This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to make money having fun with pets
Enter your pet into shows or other pet competitions to win prize money.
If you have a purebred dog and are passionate about the breed, dog shows could pay off. However, many people find that the overhead involved is often greater than the prize money, so most dog show contestants are in it for the fun.

Options are:
[1]. Your dog could then increase their fame, technical support, and wealth by entering the fandom. Just get there quickly so you can check in on your pet on a regular basis to verify that it's still there.;
[2]. Try finding some tech prizes, like video game prizes for winning the dogs class. You could also try renting your dog to one of your friends for a reasonable fee.;
[3]. Join non-profits on animal forums to help make money. Animal blogs, animal books, other websites, and even message boards all indicate ideas for your organizations.;
[4]. Model your pet if it is well behaved and attractive. Most magazines and advertising agencies occasionally use animal models in their advertising campaigns.;
The answer is:
[4].