A housecat might be better at hunting mice than Bernie is with economics, but if my goal is to run a mice farm, I'm not going to vote for it. (I suppose the current Republican candidates in this analogy are exterminators)
Gonna have to point out that your analogy is terrible in regards to the economy. Bernie is a democratic socialist; he believes in social programs, some public industries, and thorough regulation-- but acknowledges the need for a market and market forces to build a healthy economy.
In your analogy about mice farming, cats and exterminators are forces that completely work against the objective of farming, while Sanders is a farmer, but that's not the actual dynamics of the issue.
All of the candidates believe that we need market forces and a market to grow a healthy economy; all are in favor of letting that market work.
The only difference are the varying degrees to which they believe in intervention. Intervention comes at the cost of growth but enables some social goods and wealth redistribution that may bring a higher value than the sacrificed growth. Bernie is just willing to sacrifice the most growth for social goods, but that doesn't change that he and all the other are pro-market, pro-growth.
Using your mouse farming analogy, it would be more like this:
Bernie: believes in regulations (domestic and foreign policy) to promote the ability of individual mouse farmers to stay independent and work, grow, and go to market. You've got comparatively smaller economy, but you may create the highest standards of living and the greatest social good (with the right mix of market and regulation). Too much regulation, and you do risk impoverishing everyone by not having enough productivity to support the standard of living you've created with social programs, but with Bernie's vision this is highly unlikely. You also lose a degree of innovation and development of mouse farming technology.
Hillary: would be willing to let investment banks buy and consolidate mouse farms or let big mouse enforce a nursery system that puts individual farmers at a disadvantage, but she would support regulation to protect the voice of those farmers and prevent fraud. You've got the richest economic model here (highest possible GDP), probably overall decent living standards, with a bigger wealth gap, and a greater risk of financial crisis. The highest degree of innovation and development of technology, which creates even more wealth.
Ted Cruz: Fuck the regulation-- we see a massive boom and bust economy with big mouse, speculators, mouse crime syndicates, etc. have their way, and own all the policy makers who might as well be lobbyists for the industry. Players in the market are too busy swindling each other and the common man to direct any productivity towards creating real economic value. All the greatest innovations are in how to cook the books. Greatest risk of financial crisis.
Trump: Similar to above, but he does build a giant wall (which may or may not sink the farmers) that prevents Chinese mice from entering the market and stops some Mexicans from farming. Likewise, similar to Ted, but with some protections for farmers against foreign competition. However, you might piss off the Chinese so much that they won't bail you out when your bubble bursts.