This is what I found for Spokane
Section 17C.310.100 Keeping of Large or Small Domestic Animals
Where Permitted.
The keeping of large domestic animals is permitted outright only in the RA zone. The keeping of small domestic animals is permitted outright in the RA, RSF, RTF, RMF and RHD zones and any zone that permits dwelling units. The definitions of large domestic animal and small domestic animal are stated in chapter 17A.020 SMC, Definitions.
Standards Applicable to Keeping of Large or Small Domestic Animals.
The following ratios of area to animals apply:
Large domestic animals: Three animals per gross acre on irrigated land.
Large domestic animals: One animal per gross acre on non-irrigated land.
Small domestic animals: One animal per two thousand square feet of land.
Animal Enclosure Setbacks.
No structure or enclosure for animals or poultry other than fencing or grazing land may be located less than ninety feet either from the centerline of any street nor from any adjoining lot.
Quote: