Some people think that it is good to keep pets at home

Some people think that it is good to keep pets at home. But there is no doubt in my mind that keeping pets at home is not a good idea. Firstly, pets need a big space to play. Secondly, it is too expensive to keep them.

Pets are very active creatures. They always need enough space to play and run. Any house is too small for animals, as they are very energetic. When pet does not have space it becomes inactive and it is possible to have disease.

Animals need caring. All the things what is necessary and important for them is not cheap. Therefore keeping pets is expensive.
The obvious conclusion to be drawn is that pets are very active and they need a big space to live well.

- FirstlyFirst , pets need a big space to play.

- SecondlySecond , it is too expensive to keep them.

Makrine, as you can see above, there's very few and minor corrections that I made, simply because your essay is written well.
However, your essay is quiet short, I suggest adding a few more paragraphs to it and elaborate your points further.

I, myself is an advocate of animal welfare. I always strive to promote and educate people about taking good care of animals.
Animals in general are very delicate, sensitive and they are our help in times when we cannot trust the people around us anymore.
Taking care of animals is indeed very tricky, not only because they require undivided attention and a little bit of expenditure, also because they need constant training and we need to nurture there capabilities of helping people and even further, save lives.

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You can add a few points from the one I've written. I hope it helps.

Keep writing

Cheers!!!