Answer: Fido's share of the dog food is 14.47%.
Step-by-step explanation:
Since we have given that
Part of dog food Denver gets = 
Ratio of the rest of food shared by Engle and Fido is given by

So, Remaining part of dog food is given by

Share of Fido for the dog food is given by

Hence, Fido's share of the dog food is 14.47%.