[alecr95]

Regular air duster cans work just as well and are significantly less expensive than their refill cannisters.

After a few times the cats avoid the sprayer, so you don't churn through them as fast as you'd think.

[Telemakhos]

Compressed air sold in stores usually contains bitterants and skin-dyes and other chemicals to deter abuse by people seeking to use them for getting high. If you're worried about an animal's health, spraying it with those added chemicals might not be congruent with your initial anxiety.