一犬 is read as いっけん (ikken) and means one dog.
いっけん
ikken
ひとこと
single word
いっか
(one's own) style
いちや
one night
いちど
temporarily
いっぽう
on the one hand
いったい
one Buddhist image (or carving, etc.)
いちいん
one person
いっさい
absolutely (not)
ひとくち
one share
ひとめ
complete view
いちどう
all present
いっぴん
finest item