Invisible Fence Brand Play Safe. Worry-Free. Keeping pets happy, healthy & safe @home IM Invisible Fence of Southern Maine 800-585-2803 southernmaine.invisiblefence.com @2018 Invisible Fence of Southern Maine. Invisible Fence is a registered trademark of Invisible Fence, Inc. All rights reserved. Invisible Fence Brand Play Safe. Worry-Free. Keeping pets happy, healthy & safe @home IM Invisible Fence of Southern Maine 800-585-2803 southernmaine.invisiblefence.com @2018 Invisible Fence of Southern Maine. Invisible Fence is a registered trademark of Invisible Fence, Inc. All rights reserved.