A ‘no cat for a pet’ saying

Informant: My dad used to say this to my sister and I when we where younger and asked for a pet, specifically a cat

Original Script: ” we can’t have a cat, they lick the butter”

Thoughts: When I was a little girl and asked my parents for pets specifically, a cat my dad would say they licked the butter, when i got older I asked him why they licked  the butter? He just started laughing and said he made it up, that he just saw it on a t.v show.