Cats can’t have Down syndrome and autism. Cats have only 19 pairs of chromosomes, and Down syndrome in human beings occurs with the presence of an extra pair of chromosome 21. So, as cats don’t have chromosome 21, they cannot have Down Syndrome.  Similarly, the neurodevelopment condition of autism does not happen in cats.  However, cats often have symptoms and behavioral patterns that are similar to Down syndrome and autism.   Wobbly walks, sudden tremors, and difficulty in movement are some symptoms in cats, replicating Down syndrome symptoms in human beings. Autism-like behaviors in cats are repetitive activities, making repetitive sounds, and aversion to touches.