It is basically similar to its small dog version, having the same 30 - day effective period and 24 - hour onset of action. (mypetneedsthat.com)
The one we use is straw dog version... minus his awesome previews. (sbnation.com)
The older male (120 #) takes his job very seriously and will chase stray dogs all the way back home so I think the stubborn dog version would be better. (dogfencediy.com)