Smurfs lived in a place with crappy soil and weather conditions which caused those apples to be malformed and freakishly small. Like their blue balls. (Excepting papa smurf, obviously. He kept smurfette smiling.)

But to answer your question: a big enough cat to feed a Chinese family with some decent leftovers for them to sell to tourists.

Where the fuck are you getting 6.5 inch diameter apples from? Apples that are over half a foot tall is preposterous. That's larger than big grapefruits and even many melons. I want to see these apples and a ruler next to them.

The average wild apple is 2 inches tall. the Average smurf is 3 apples tall. Ergo average smurf is 6 inches tall give or take. That means a largish cats head would be about the same length as a smurf, and gargamel would be about 10 smurfs tall give or take.

These numbers are generally reflected in the cartoon perspectives.

So azriel was a largish house cat and gargamel was about 6 ft tall.

What the purpose of living if you don't have a dick

It always pissed me off that they said the smurfs were 3 apples tall. There's no Goddamn way they were that big and everybody knows it. MAYBE one apple at most.

Azrael was a regular sized cat. Gargamel was a regular sized human with a regular sized jew nose.