If your only income is $200 biweekly, then having a dog doesn't seem wise at all.
Assuming the dog is 50-100 pounds, average food intake would be about 3 to 4 cups per day (assuming all he eats is dry dog food). Each cup is 8oz on average, so that's 1.5 to 2lbs per day. Added up over 2 weeks, this is This is 21 to 28 pounds. Let's say 24. On average, 24 pounds of dog food is like $45. Your dog gets almost 1/4 of your pay?