Boarding ladders, lifejackets, goggle/sunglasses, and other gear designed to make a dog's life easier on board.
Good discussion of what to expect from a feline shipmate, with some tips on handling litter, cat self-rescue equipment,
A family of liveaboards write a free e-zine for cruisers. Articles are categorized by their subject: experienced cruisers, education afloat, pets, budgeting, and a good section for those not yet afloat but dreaming about it. Back articles are available on their site.
Just what the title says, from beef liver, wheat germ, and whole-wheat flour.
Miniature transmitter can be attached to a pet's collar, plus handheld directional antenna for tracking the pet. Range is up to one mile in the open.