To have an animal is very nice, but it has its consequences.

On one hand:

It does you more happy,

It does you company,

It helps to persons with diseases,

It is very affectionate,

It don't do noise,

It is calm,

On the other hand:

You have to take care of it, to be attentive to the food and the water,

You must to have space in the house for it,

It scratch the furniture,

Unlike the dogs it don't come to you when you are called it,

You have to take it to the veterinarian.