This study assessed job satisfaction among employees of Animal Care Services Konsult Limited, Ogere Remo, Ogun State, Nigeria. Multistage sampling procedure was used to select 73 respondents through structured questionnaire. Data were collected on personal characteristics, promotion criteria and job satisfaction of the employees. Data were also analysed using descriptive and inferential statistics. Results revealed that mean age, monthly income and years of experience were 32.3years, 79,901.2 naira and 5.8years respectively. The findings also revealed that more than half of the respondents were male (54.8%) and married (53.4%) respectively Excellent on-the-job performance (𝑥̅ =4.59), good attitudes toward work (𝑥̅ =4.58), and workrelated skills and competencies (𝑥̅ =4.51) were the major identified promotion criteria used. While relationship with peers (𝑥̅ = 4.64), job security (𝑥̅ = 4.52) and responsibility (𝑥̅ = 4.41 were respondents' major job satisfaction indicators identified. However, educational qualification (𝑥̅ = 2.25), favouritism (𝑥̅ = 2.15) and financial status of the organisation (𝑥̅ = 2.12) were challenges affecting promotion criteria. Significant relationship existed between sex (χ 2 =0.443), age(r =0.282), income(r = 0.113), promotion criteria (0.371) and employee's job satisfaction. This study concluded that most employees demonstrated good attitude towards their job which enhanced their satisfaction. Therefore, self-development through additional higher certificate and training for employees are highly recommended. This study specifically describes the personal characteristics of the respondents, identify various promotion criteria and determine employee's job satisfaction among the respondents in the study location..