My dog (female 18 month old Labrador) understands quite a few as well - fetch, here, slow, drop, leave, go, now. If I want to add emphasis, though, increasing t

My dog (female 18 month old Labrador) understands quite a few as well - fetch, here, slow, drop, leave, go, now. If I want to add emphasis, though, increasing to two syllables seems to help. For example "slowly" or "drop it".