Conclusion

1. My hypothesis was correct. Price does make a difference as to which treat the dog will choose.
2. Although,the most expensive treat, Barking Mad at $66.67 per KG, was the dog's best second choice, the best first choice was Beggin Stirps which cost $14.12 per KG. Also the dog's best third choice treat was T-Bonz which cost $12.37 per KG.
3. Although apples and bananas are probably the healthiest and the cheapest treats, the dog did not pick them much.
4. Looking at the ingredients, I think the dog liked the unheathly treats the most.
5. Maybe, in the future experiment I can try rubbing apples and bananas in bacon before the trials to see if the dog will choose them.