Dolores was a very loved by her parents, her mother would make her pink dresses. Once her father bought her a pretty little Persian kitten that she loved very much. Sadly her mother passed away when she was 8. Her father unable to cope with the pain. Took to staying out all night drinking leaving little Dolores alone at night. He brought home a muggle woman, they were married soon after. The woman had 5 previous children. They were very rude. Dolores was forced to care for them all. Her father banned any mention of magic. One of the children even killed her cat, when Dolores tried to save it by pushing the child away, they ran crying to their mother lying claiming they were innocent. Her father believing his wife beat Dolores as punishment.
Finally her Hogwarts letter came, her stepmother thinking she was going to bordering school tried to persuade her father not to let her go, almost succeeding.
She hated children and muggles ever since.
Later on Dolores’s Patronus took the form of the only happy thought she had a Persian cat that reminded her of her mother and the love she once felt.