When I got married, I got two cats as part of the deal. A couple years later, we moved, and as part of that move we agreed to take only one cat with us. The more aggressive cat we gave away to friends who had the space. It wasn't too long after we moved to where we now are that we acquired a dog. We picked her up on our anniversary at the Fox Valley Humane Association. She is now perhaps seven years old. For sometime in there, we also had a rabbit and a hedgehog.
When considering adding a pet to your family, consider it very closely as this is a long term commitment. A pet may have a low initial cost but you may have to pay to get it neutered or spayed before taking it home. You may have to pay for shots and vaccines. If this is your first pet, you may have to buy bedding for it to sleep in. It will likely need a collar and some chew toys. Your city or town may require that you pay for a license. Around here it is $3. Your pet is going to need to eat so you will need to buy it food. I pay about $30 on food for our dog and maybe another $10 on our cat. Over a year, that can really add up.
Personally, I like having a pet. They are cute, small, and interesting for the most part. The problem I have is that it is hard to say "yes" to one and not acquire more. Once the door is open, more seem to find their way in.
The other issue with pets is the length of time they live. They can live a really, really long time. Consider that before getting any type of animal.
Here are these some things to think about before getting a pet. The expenses and the total cost. The wear and tear on your house and furnishing. The length of time you are committing to.
My final recommendation is to get one pet and leave it like that. Two can really add up the costs and it can also be a lot of responsibility.