Maybe wolf this popular, a pet (3,3)
I believe the answer is:
hot dog
'maybe wolf this' is the definition.
('wolf' can mean eat)
'popular a pet' is the wordplay.
'popular' becomes 'hot' ('hot' can be similar in meaning to 'popular').
'a pet' becomes 'dog'.
'hot'+'dog'='HOT DOG'
(Other definitions for hot dog that I've seen before include "Sausage in breae roll" , "Fast food - panting spaniel?" , "Long roll containing sausage" , "Sausage in a bap" , "Item of fast food" .)