PROBLEM TO BE SOLVED: To provide an apparatus and method for supplying concentrated oxygen for animal treatment which prevents the concentration of oxygen supplied to the space part of a housing part from being raised and which effectively exhausts gas of carbon dioxide, moisture, etc. accumulated in the space part of a housing part to the outside of the space part.SOLUTION: A second mixed gas obtained by mixing air into a first mixed gas where oxygen and nitrogen are mixed in 45:55 is supplied to the space part M of a housing box 24 by a flow rate of 10L/min. A part of the second mixed gas is exhausted to the outside of the housing box 24 with the carbon dioxide, moisture, etc. stagnated in the space part M through the through hole 28 of the housing box 24.COPYRIGHT: (C)2008,JPO&INPIT【課題】収容部の空間部に供給される酸素の濃度が高くなることを防止でき、収容部の空間部に滞留する炭酸ガスや湿気などの気体を空間部の外部に効果的に排気することができる動物治療用濃縮酸素供給装置及び動物治療用濃縮酸素供給方法を提供する。【解決手段】収容箱24の空間部Mには、酸素と窒素が45:55の割合で混合された第1混合気体に空気が混合された第2混合気体が10L/分の流量で供給される。また、収容箱24の貫通孔28から第2混合気体の一部が空間部Mに滞留する炭酸ガスや湿気と共に収容箱24の外部に排気される。【選択図】 図1