Hello there Barb, I’m terribly sorry to hear the double dose of bad news you have been receiving - I do hope that your dog’s condition ends up improving! On a more positive note, though, It is my pleasure to welcome you to Living With PsA. It is my hope that you begin to feel like a a member of our wonderful extended family around here, so that things become a little less lonely for you. I thus encourage you to start getting involved in discussions and also to check out the “How To Use This Site” tab up top, for some useful beginner tips.
In regards to your questions, I actually searched for the word “summer” in older topics, using the Search Icon (top right corner of the white bar). I found multiple people mentioning how the heat and humidity seem to worsen their symptoms - and you can take a look at what some of them said right here:
https://discussion.livingwithpsoriaticarthritis.org/search?q=summer
Anyways, I wish you the best from here on out - and don’t ever hesitate to contact me if you have any questions or concerns!