Do animals have signs?

I would think so because they are also products of the Earth and they go through cycles just like humans (and like Astrology is said to reflect).

Do you think animals are affected by Astrology? Why?

Yes, there is astrology for pets.

For example, my cat is a pisces (march 1st, 2007:)) and exhibits the typical pisces personality. Very sweet and affectionate and cuddly, will drop whatever he's doing every time I call him, gets even more cuddly when I'm sick or upset trying to cheer me up, doesn't like loud noises, but loves music. Seems to be able to tune in to whatever I'm thinking. Yeah, he's a good kitty:)

Retro, absolutely!
I make it a point to know my pets' astrological signs and deal with them accordingly. Even if you adopt an adult animal and can't pinpoint their birth dates, you can usually figure out their sign as you become better acquainted with them.
I have an adult cat whose birthday is unknown to me, but his personality dictates that he couldn't be anything but a Leo!
And I recently adopted a stray kitten. My vet and I have figured out her age closely enough for me to know that she's a Gemini...and she acts like it too, smart as a whip, vocal, and full of energy!

Hello:
every living been is touched by the hand of nature and its cycles.So the animals, with nerve systems and without nervesystem and vegetal world.We all got genes so we a re affected.We share more than a 90 % of genetic information .

Regards.
Kacce

Yes. My friend has a Libra dog who can be mighty lazy. (Librans can be lazy when they are uninspired.)

Yes, my cat, Sam is a Gemini. His birthday is June 2nd. And he is Gemini all the way because he is always flirting with the company. And just as the twins would have it, sometimes he's super nice--meowing in my face and welcoming a pat on his head; other times, he sits in the corner growling whenever someone makes a sound.