Hi Ellie, we had severe thunderstorms come through yesterday, lost power till about 10:30 PM. So I'm late posting in this thread.

Prayers for Sparky and you, from RI. For humans with CHF, high heat does make things much worse.

My friend's mom has CHF and was on Lasix. She had constant issues and hospitalizations. They finally sought out a doc in Boston, who said about 20% of patients, Lasix does the opposite of what it is supposed to. He took her off that and put her on something else, she's been must better for a year now. So the vet can change Sparky's meds and perhaps this will help him as well.

Sorry you and he have to struggle through till Monday.