Do I need to be concerned about Treated Timber and My dog??

No. We’ve looked into this, spoken to a Outdoor timber specialist and the answer is that for your Dog to get enough toxins in him/her to be you to start to worry about, they would need to eat their entire kennel, the floor of the kennel and for desert, the run floor – we’d like to think you would notice something was going on before then!!   🙄