"The dog gets angry when he sees cats."
Translation:Hunden blir arg när han ser katter.
Differences between languages. Pets are usually referred as "him/her" in English, where as it's probably more common to use "it" in Swedish, I would guess. I don't know for sure how it is in Swedish, but it varies a lot by language. For example in my native language (Finnish) it would simply be wrong to refer to a dog as "he".