408lightning..... I'll preface what I'm about to say by saying that as was already pointed out, this is a dog and I have no idea if their brains and bodies react differently to marijuana than a human would. I suspect there are differences, so keep that in mind.
If you want to avoid your oil being psychoactive, do not decarboxylate the flowers when making the oil. In other words, don't heat/activate the Cannabinoids. Prior to heating or putting a flame to marijuana, THC is in the form of THC-A which is non-psychoactive. Once the product is brought to a certain temp, the THC-A converts to THC.... which gets us high. So, for your pooch or anyone else looking to take advantage if the therapeutic properties of marijuana but don't want to get high, simply do a dry ice extraction or ice water extraction of the trichomes and add that to room temp oil of your choosing, then refrigerate. The same is true for CBD. You will absolutely get a high (although it is a different high than THC rich product) when you decarboxylate high CBD flowers as well.
I make oils for patients that can't/don't want to get high, and it is every bit as effective for treating their ailments as a decarbed oil is.
Best of luck to you. Your dog is very lucky to have such a caring human companion!