The invention discloses a health-care agent for old dogs. The health care agent for old dogs consists of the following components in parts by weight: 5-10 parts of egg microcapsule powder, 0.3-1 part of a yucca extract, 5-15 parts of wheat hydrolyzed protein, 0.5-1.5 parts of astragalus membranaceus polysaccharide, 1-2 parts of probiotics, 15-25 parts of puffing oat flour, 10-20 parts of puffing corn flour, 0.5-1.5 parts of vitamin C, 30-40 parts of nonfat dry milk powder, 2-5 parts of chicken liver powder, 3-5 parts of glucose, 2-4 parts of xylooligosaccharide and 3-5 parts of sodium butyrate. According to the health care products disclosed by the invention, the digestion function of intestinal tracts of the old dogs can be improved, the utilization of nutrient substances can be improved, diseases of intestinal tracts can be prevented and treated, the immunity of organisms can be enhanced, and halitosis and the fetor of excrement can be reduced; the health care products are notable in effects, safe and free from toxic and side effects.