There's a symbol I've seen float around that some dog-loving zoos use (which I guess could be modified by an artist to fit a different type of animal) that looks like a paw inside of an upside-down dog heart. It's less known than the zeta symbol, which would probably get you spotted immediately by anyone who has any relation to the furry community as well, since they're pretty hyper-vigilant of zoophiles. I don't personally have this tattoo, but I think it could look cool! It'd be easy to brush it off as any old animal lover tattoo.
