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You would have to apply for a business license from the City of Portland in order to conduct business activities for profit. If you are in a residential area, I would opine that a kennel type business would be prohibited by local land use ordinances and code restrictions. The way to know for sure would be to contact the local Planning and Zoning office to see if the area where you are located is zoned to allow for a kennel type home business.
You can contact them here to see if it would be permitted down under the planning and zoning number:
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