Yesterday Tux and Buffy came out for some quality time and by the end of the hour FiveCatsDad and I were sniffing. He speculates it could be mites from Buffy's leg but could be just their fur in a closed environment. The children were ok though. Their immune systems are stronger and with each exposure they'll be stronger. FiveCatsBaby is very thrilled with them and rushes to pet them, much gently this time.
Tux looks more interested in something else than the dinosaur book I put beside him as a prop. :)