The fare for a dog (4)
I believe the answer is:
chow
I believe this is a double definition.
'the fare' is the first definition.
(chow is a kind of fare)
'a dog' is the second definition.
(chow is a kind of dog)
'for' acts as a link.
(Other definitions for chow that I've seen before include "Long-haired dog of Chinese breed, or informal food" , "Mixed < dog" , "Grub" , "Long-haired Chinese dog or slangy food" , "Dog (from China?)" .)