器 is a Japanese kanji written with 15 strokes, listed here under the keyword “utensil”. It is built from 口 (mouth) and 犬 (dog). In Remembering the Kanji by James W. Heisig it is frame 127.
On KumiJi Glyph Explorer, open the parts search and type “mouth” + “dog”. 器 is among the results, together with every other character containing the same shapes.
Open 器 in the interactive kanji search
to expand every part down to its smallest pieces, add your own names and mnemonic stories,
or search for other characters by their parts.