In-Home Dog Training and Pet Care Services for Peaceful, Happy Home. Off Collar offers a comprehensive range of Pet Services including Dog Training, Dog Walking, Dog Sitting, and Kitty Sitting. Each service is tailored to your pets specific needs and provided in the comfort of your own home. We work with Pet Owners in the Alexandria and Arlington County, who are searching for top-quality pet care, and true peace of mind while they travel or when they have to leave their pets for long hours.