you can, but you have to use FedEx and you have to have a specific label on the box regarding the batteries. FedEx can help you. I've posted a laptop with lithium batteries before.
it’s not one tourist visa if she’s trying to be here for a year. You can coddle people all you want, but knowing the facts will allow them to make an informed decision. I’m not coddling anyone.
you realize that you could end up in a situation where you are no longer allowed entry because an immigration officer believes you’re trying to live in Thailand on improper visas and your dog is stuck here without you? Importing your dog might even be further evidence to support that belief.
Also technically not legal to work without work permit or LTR visa.