If you are a lover of beasts, how many times have you admired those in other countries where the profession is to swing dogs?
There is no such thing as a profession in us and rarely anyone would leave pets to anyone, but that does not mean that there are no other similar hobbies that can turn into work.
Of course, maybe at the beginning (or never) you will not be so rewarding for a single job, but you can use the free time and even if you have the primary job to earn a penny plus.
This will be something you want and what you enjoy, which fills you and you do it with a grain, and it will bring you some kind of income.
See which hobbies and interests can become your second job:
If you want languages you can teach or translate
Become a tourist guide if you want a trip
Keeping children is always an open option
Start shooting professional events
Make repairs for acquaintances for plus cash
You can be a barman in your free time if you are for cocktails
Get dressed in Santa Claus or other event characters
If you are traveling so, open your home for traveling and offer a bed for money
You can start to sell artwork for an occupation
If you are a fitness fan, you can become an instructor