Just make sure that they don't start to chew on the treated wood, I had a dog years ago that had started to chew on the corner of his NEWLY BUILT dog house, and a splinter got lodge in his jaw. This got infected, the vet said it was mainly due to the chemicals used to treat the wood, antibiotics and he was good as new. This was about 8 years ago, so like EWO said its a lesser amount of chemicals used to treat the wood now, so I'd say go for it. The only problem I had was from a destructive hound, all dog houses were built the same, no other problems.