Seems like you are building an obsession with cats. Sees cat>gets a treat> rather look at cats. Or playing peekaboo with seeing a cat. This is what 1 and 2 year old children like, playing peekaboo. It is self rewarding to see a cat. Peekaboo
Howabout nipping this in the bud before he fixates on a cat. Always have a drag line on him. When he first glances at a cat, say NO and say come. Reel him to you and praise and pet lavishly. If fixated on cat say OFF or Leave it and reel him in. Tell him to sit, focus on you and then praise.
I think eventually he will get his eye dotted by a cat but that may not end well. I sent you a PM.
He prayeth well who loveth well
Both man and bird and beast;
He prayeth best who loveth best
All creatures great and small;
For the dear God who loveth us,
He made and loveth All.