日語 Japanese Ask Questions Thread2 質問

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Japanese - Ask questions thread
http://dis.4chan.org/read/lang/1174719097/l50

>>228
I think there is "u" in the end, i.e., it's a long "o" - でしょう, ne!?
<--NOW MY QUESTION-->
Why are Japanese Wikipedia's articles on cat and dog called ネコ and イヌ (instead of kanji)? Are there many words written in katakana, is it a growing trend?
(because I don't know any katakana and start to wonder if it's being used for something more than Engrish and onomatopoeia)