What's the Name of That Book??? discussion

Thin chapter book about a cat that runs away from its mean witch owner. Finds home with normal family and wants to stay with that family when the mean witch comes to collect it.

Black & white illustrations? possibly a scholastic-paperback? Maybe the late 1960s/early 1970s?

Gobbolino the Witch's Cat?

The Wednesday Witch, by Ruth Chew? It was first published in 1969 and has little black and white illustrations throughout.

"Meow." It was the thin black cat, sitting sadly on the doorstep.
The witch must have forgotten her cat, thought Mary Jane, or perhaps she is trying to trick me.
"Meow," said the cat again. Then, to Mary Jane's surprise, it said, "I'm hungry."
Mary Jane couldn't help feeling sorry for the skinny cat. "There's some tuna fish left over from lunch," she said. "Would you like that?"
"I don't know," said the cat. "I've never had fish. All the witch feeds me is toads -- when she remembers to feed me at all. And she has a pot of witch's brew that she thinks is delicious, but I can't stand it."
"What's your name, cat?"
"The witch calls me 'Hey, you!'"
"Oh, you poor thing!" cried Mary Jane, and she scooped up the cat. It was so light! Mary Jane could feel all the bones under the scraggly fur. She carried the cat into the house and shut the door.