Many girls also love dogs and, by extension, guys who have dogs. I saw this a lot in college, where guy with dog = instacrush by half the females in the vicinity.

Alas, I'm allergic. To dogs, not girls, though given my luck with the latter, maybe it's both.

I thought about starting a puppy rental business for college campuses. I imagine you could charge over $100 per hour b/c of all the girls who would flock to pet the puppy and then happen to think "wow what a nice guy".

It's a good idea, I wouldn't try and do it on college campuses, though. You can lose some serious coin trying to sell good but expensive things to broke kids.