Gerry, what a great thread! I could prattle on for pages when the topic is pets, especially mine :) But, very interesting to read what works for other forum members and their beloved pets.
The short version for us: We will not be traveling again, unless we can take our much-loved dog along with us.
Background: When we adopted him (before the pandemic) , we were prepared to forego future overseas travel. When he was about a year old, we did take a short trip over the holidays. We visited (with him) a few highly-recommended kennels, settled on one, then took him out to visit (sniff around) a few times prior to the trip. He did fine. That kennel gives very personalized treatment to each dog (owner selects from various packages) and we were sent photos of him enjoying his daily play times, etc.
Then several years rolled by, and he got very accustomed to daily routines at home. Realizing life is very short, coupled with not knowing what could be around the corner for the world, we decided to celebrate multiple milestones in our lives (the list is long) with a multi-week, multi-continent trip last fall. We were on the plane en route to the tour's first destination, and the kennel came up on my phone (cringe). Then he was taken to the vet the kennel uses and the medical director called us a few hours later to update us: stress colitis .... Rx, probiotics, special food, etc....we changed his play times to extra snuggles and hugs......he got thru it. I had already felt guilty about leaving him (and, yes, he likely sensed it, as dogs can smell stress... wondering if we were giving him away). I swore right then and there we would never do that again.....never!
Fast forward, but totally unrelated, many months later he had an issue and was diagnoses with suspected PFK (Google PFK in dogs, and you can read as much or as little as you would like). I say suspected, because only DNA genetic testing can confirm.. A DNA sample was sent off with a very low likelihood of a match (only because such DNA tests are typically able to be confirmed for only the specific breeds any lab has studied). He was on IVs overnight and tests were done for all other possible suspect issues (by a specialty urgent care facility here...so good that vets often refer patients to them), follow-up blood monitoring, and PFK was the only remaining likely suspect. Staying calm, not overheating, no heavy exercise and on and on is the ONLY treatment outside of a bone marrow transplant. So, his boarding days are definitely over.....chasing the frisbee and ball (which he oh so loved) is over. I had previously (over the last several years) thought about starting an EBD (our term for an emergency back-up dog.....a second in command) puppy that I would put thru full therapy dog training........but (isn't there always a "but"?) being around other unpredictable dogs (or small kids) is not recommended for a PFK dog.....a puppy could stress him....so we will hold off on that. Our current dog went thru the canine good citizenship program, but could not seem to master the "leave it" command, but otherwise is pretty perfect.
We are hopeful that we will figure out a way to take him with us (road trip) for possibly a winter beach vacation in coming years, staying at a place that would allow a very well-trained dog of his size, especially IF we wind up moving to a more lock-it-and-leave-it situation. But, likely we would try a weekend trip closer to home first for the maiden voyage.
Question for anyone who has endured reading my answer so far and who has used a pet sitter: I have read panic posts on Nextdoor from time to time, that someone's pet sitter quit suddenly either right before or during a trip.........traveler in panic mode appealing to anyone in the public to help them...whatt????? That could be a really bad situation. What back-ups do you have for someone trusted and who could then be well-trained re: your pet's needs?