German translation found here

In the pattern I call for a 4mm hook but if you crochet tight like I do then you can use a 5mm. I used a 4mm to make the mouse and a 5mm to make the bunny. It doesn’t really matter, whatever works for you. If you see gaps in your stitches then try a smaller hook.

The bunny is about 8 inches tall from foot to top of head

The mouse pattern can be found here on my ravelry designer page and is also linked in the introduction of the bunny pattern.