Here are some good slogans on saving animals:
"When you kill animals your showing the world just who really is the animal."
"Save the wild or you will be called as wild."
"A heart beats in animals the same as in us.""Save ANIMALS and help ourselves from being CANNIBALS."
"We can judge the heart of a man by his treatment of animals."
"Stop Senseless Slaughter."
"Cage the animals who cage the animals."
Hope this helped!! Good Luck!!