as dom said there are many issues with it.
1) you would have to insure the snake, if it dies bank still wants its money; much the way when you buy a car on credit you need the best insurance or get a mortgage you need home owner's insurance. to complicate it you are dealing with a living thing that could just die so it is all the riskier making the interest rate go up (risk = higher rate) and that is compounded by the fact that the insurance on such a piece of property will be even more expensive because of the risk
2) such a variable market no one can predict what the price of any morph will be in a year. how do you know that breeder x hasn't been secrectly producing 5000 of morph a,b,c,d,e,f,g and plans to sell everyone of them make his money then move on to another species after having virtually crashed the market, if the market crashes your snake will make you no money so why not default
3) what to do with repod animal, needs to be cared for and how do you repo an animal or stop the person from just up a selling the animal and defaulting the loan. hey they get lots of free money. bank can't really prove where the animal went. there is no title or deed that is needed to sell an animal, the idea wouldn't really work even if there was
4) financing of living things is very risky
and on a side note personal loans are very difficult to get and you have to have nearly perfect credit, and a pretty good income stream, even then it is limited to tops of $10,000. interest rates on an animal would probably be worst than the interest on a credit card. if you can't get a credit card with the limit no one else is going to give you that kind of money with out colateral.
-----
Peace
Derek