Dreaming about animals and death has a multitude of connotations, and death and animals are themes that are very common in dreams. In general, dreaming about animals relates to the more primal instincts of your soul.
Usually, I would consider that dreaming about dead cats means that you're lacking independence and autonomy in your life at the moment.
If you're a woman, it may also mean that you are not realising the extent of your feminine power.
What does dreaming of dead cats mean?
Dreaming of living cats symbolises independence, creativity, sexuality and power. Dreaming about dead cats signifies the loss of these in your life.
It may also mean that the bad luck that you have experienced recently is finally over and that things should be looking up.
If you're a woman, cats symbolize femininity and sexuality. A dream about dead cats may be alluding the loss of these things in your life, and a sign of low self-esteem.