Can anyone remember a 70's kids prog where they used to say size of a cat ( or any other animal) ty

How about BraveStarr? It's from the 80s and they say:
Eyes of the Hawk
Ears of the Wolf
Strength of the Bear
Speed of the Puma

Arabian Knights is an animated segment of The Banana Splits Adventure Hour, created by Hanna-Barbera Productions. The series is based on Arabian Nights, a classic work of Middle Eastern literature.
In the show, the character Bez: A dark-skinned man who is often portrayed as wearing a turban and green clothing; he is also known as ‘Bez the Beast’, for his ability to transform his body into the form of any animal known to man. Often, he triggers this ability by speaking the phrase “Size of a-!” and speaking the name of the animal he wished to turn into. If the creature is small enough he can turn into multiple versions of them. Such as turning into a million bees. He can also transform into creatures like Winged Horses and Rocs. His shapeshifting makes him a handy spy for the knights.