Also, I like animals very much and I would like to help them when they suffer.
I also like animals very much and I would like to help them when they suffer.
Is also at the beginning of the sentence correct? Does it sound too formal to you?
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Both sentences are fine to use. There has been a rule passed down through generations, incorrectly telling people that they must not use words such as but, or, and or however at the beginning of a sentence.
Using conjunctions at the beginning of sentences is not forbidden. And, you can choose to do this to emphasise a point. However, you need to be careful not to do it too much.