|« Псина||Пёс »|
The Russian word дог is a false cognate: it doesn't mean dog. It means Great Dane. Although regular nominative plurals often end in -ы, here spelling rule 1 interferes so that the plural is доги. The three Russian spelling rules are:
Spelling rule 1:
After г, к, х, and ж, ч, ш, щ — never write ы, instead use и.
Spelling rule 2:
After ж, ч, ш, щ, and ц — never write an unstressed о, instead use е.
Spelling rule 3:
After ж, ч, ш, щ, ц, and г, к, х, — never write я or ю, instead use а and у.