I'd guess the chlorine bleach is the problem. Who told you to pour that in a system designed for bacterial decomposition of waste material? Chlorine will kill the active organisms.
A simple Google search brought up this site: http://www.soil.ncsu.edu/publications/Soilfacts/AG-439-13/
Make sure you are aware of the types and amounts of extra waste materials that are poured down the drain. Limiting the use of your garbage disposal will minimize the flow of excess solids to your tank. Garbage disposals usually double the amount of solids added to the tank.
Do not pour cooking greases, oils, and fats down the drain. Grease hardens in the septic tank and accumulates until it clogs the inlet or outlet. Grease poured down the drain with hot water may flow through the septic tank and clog soil pores completely.
Pesticides, paints, paint thinners, solvents, disinfectants, poisons, and other household chemicals should not be dumped down the drain into a septic system because they may kill soil microorganisms that help purify the sewage. Also, some organic chemicals will flow untreated through the septic tank and the soil, thus contaminating the underlying groundwater.
Good luck with that. And save the dog food for the dog.