I don't know about dogs, but my cat got stressed a few years ago because I moved all the furniture and took the carpet up to laminate the living room floor!
I had no idea cats were so easily stressed but he developed a urinary infection as a result and the vet said it was the upheaval and resultant stress that had made him susceptible.
Pets like consistancy and habit, there's no doubt about that. I am sure this is because in their way they are aware that they have little control over their environment and they have to trust us completely so that when we behave in unexpected ways this threatens their security and causes stress.