(ID: realistic wood grain. Written over it in wood-coloured digital pen are the letters A, E, F, H, T, & Z on the left. They are less visible due to the way the lines blend in to the grain. On the right are the letters/runes ᚠ, ᚢ, ᚦ, ᚨ, ᚱ, & ᚲ. They are more visible due to the fact that every stroke goes against the grain. End ID)

You can see angled or vertical lines much easier against wood grain when you carve letters/runes into wood. I think the Canim would probably use wood & claws more than delicate scrolls of paper. 

(ID: A bunch of wooden tiles with the futhark runes burned/soldered/carved in them. End ID) 

They also have no round shapes which would make carving easier.

(ID: a scroll made up of sticks of bamboo, each stick of bamboo is a line of writing. End ID)

The Canim might even write their tomes like this & carve it directly with their claws. Of course, they might have an entirely different way to interpret writing because of the way their language might work. If it is more tone based & duration based, then maybe their alphabet would be less phonetic.

Another thing I think Canish will be inspired by is Russian. “Definite and indefinite articles (corresponding to 'the', 'a', 'an' in English) do not exist in the Russian language. The sense conveyed by such articles can be determined in Russian by context.” I think that Canim would very much appreciate the lack of articles. Either that or they could represent respect since the Canim are very much about respect & honour.