• sog fennel,
• xog fennel,
• cog fennel,
• fog fennel,
• rog fennel,
• eog fennel,
• dig fennel,
• dkg fennel,
• dlg fennel,
• dpg fennel,
• d0g fennel,
• d9g fennel,
• dof fennel,
• dov fennel,
• dob fennel,
• doh fennel,
• doy fennel,
• dot fennel,
• dog dennel,
• dog cennel

The adjective form of the word "dog fennel" is "dog-fennel" itself. The word functions as a compound adjective, describing a type of fennel that is related to or associated with dogs.

The plural form of "dog fennel" is also "dog fennel" as the word remains the same in both singular and plural form.

The singular form of "dog fennel" is "dog fennel". The word remains the same in both singular and plural forms.