(Not a native Chinese speaker). 兔/rabbit is marginal to me - I don't think I would even register it as a character unless it was in the right context. The others are perfectly legible. For the bold-face 猫/cat (the first one), you do technically lose some "content carrying form" as the 田 becomes a shape that does not appear in Chinese (sideways 曰), but I don't think that would actually confuse anyone in the context of the rest of the character.