Dear Oregon:
We just moved from Portland, Oregon to Singapore in December 2000, and brought our 8 year old chow chow mix and a cat. Petmovers did an excellent job once we got here (and provided lots of good info before we left), and the quarantine station was quite good. I'd obviously recommend the AC kennels which allow your doggies to go outside and bark a the goings on, but to return to the AC at their leisure.
I don't know what airline you plan to take from PDX, but we took United to LA and Sing from there, with a stop in Taiwan. United was fabulous -- they put the names of animals on the kennels and the captain went down and said "hi" and reported to us. Sing had absolutely no idea what to do with the animals. In fact, they almost wouldn't let us on the plane with them because we didn't have the import docs with us. In fact, PetMovers has all of the docs and they meet you at the baggage carousel at Changi airport, so don't let the Sing Air staff freak you out. When we got to Taiwan, I asked whether the animals had water, and they were reluctant to check, but, in fact, they did with a little polite prodding and filled the animals' water bowls.
A word of caution, though. Our chow chow was a pretty good dog before we left. She was an escape artist, and we had to have really secure fencing at our PDX residence, but that was about it. She has since gone absolutely batso over the thunder and lightening here. It is much, much louder than at home; in fact, she never even responded to fireworks or thunder before. One afternoon while we were spending time on Sentosa Island, we return to a completely wrecked house -- 2 curtain rods down, one curtain completely destroyed, three doors with significant damage, a baby crib with two slats destroyed, a dust ruffle chewed up. It amounted to about $1000 US of damage. Since then, we bought a vet quality kennel for $500 Sing for her, but she can still break out. So now we have to muzzle her. Also, she broke out with wet eczema, which required antibiotics, a GI trim, and daily treatments. The vet says it's common with sled dog like breeds. She's really miserable. Like I said, she was very little trouble at home, so I never would have predicted the problems we encountered.
Finally, people are really really really scared of big breeds here even though they are less ferocious than the little yip yip breeds that are more common. So, it's important that you have good leashes and doggie manners, esp. with 2 doggies. If you hire a maid, make sure to advise her of her responsibilities toward the dogs.
Hope this is helpful.