Sirius is a little young yet for hair ball trouble, though I suppose it's possible. More likely he either just got over excited and choked on some saliva, or got a bit of dust caught in his throat, or maybe he lost his breath for a minute.
Keep an eye out and if it keeps happening, of course bring him to the vet.
If you do decide to try some type of hairball remedy, be sure to give it on an empty stomach at least 2 hours before feeding. This is because hair ball remedies interfere with nutrient absorption. Plus, you want the stuff to glom onto hair, not food.
How's the little fellow doing otherwise? How about an updated picture?