Reviewers are largely enthusiastic about Altadena Valley Animal Clinic, praising Dr. Brennan's attentiveness and the staff's genuine care for pets. However, one detailed complaint raises concerns about billing practices, account credits, and responsiveness to customer concerns.

• Dr. Brennan praised for thorough exams, sitting with anxious pets, and answering questions thoroughly
• Strong grooming services with quality finishes (e.g., lion cuts)
• Staff described as knowledgeable, friendly, and genuinely caring toward animals
• One reviewer reported billing disputes, unused credits not honored, and difficulty reaching management
• Compassionate end-of-life care noted by multiple reviewers