you could decorate it all over with images of little fishes, toy mice, paw prints, etc. ANything that would be of interest to the cat. Or maybe just do the entire cake one theme. Like a fish or a mouse.
hope this helps!
Well, I would think a feline would be happy with a cake that looked like a can of their favorite food (Fancy Feast) or perhaps a fish.
Since all cats act like royalty, perhaps a fondant/gumpaste tin of cat food atop a pillow cake would be appropriate.
Bird watching is also a favorite feline hobby, so a Tweety Bird cake might be fun!
Hope you get more ideas. 
I just saw this little cake and thought it would be perfect for your topic. How wild would the cat go for a giant yarn ball and little kitten to go with it!
http://www.cakecentral.com/cake-photo-21316.html
Good Luck.
the yarn ball and kitten cake is just tooo adorable!
I agree with the yarn ball cake and the cake with kitty favorites. How about mixing the two ideas. Have a smaller yarn ball and the cat playing standing on it's hind legs reaching up for a fish on a stick. Have mice holding pieces of cheese with candles on it. 
ohh i like the mice holding peices of cheese, did that on my own bday cake!
Guys! It's a CAT!! Who CARES what the cat thinks!! It's not like the cat is going to call you with feedback and a written thank you note! 
Now what the OWNER would like is another story! I liked the paw prints idea for something that sounded cute for a cat lover.
(Although in all honesty, I can't believe this is a serious topic ... I thought the subject line was a joke. 
Don't crucify me ... I know there are folks who live and breath their pets. But I don't know one person who would order a birthday cake for their pet. Please don't tell me she is inviting all the other little kitties in the neighborhood and buying them little paper hats, too? 
)
LOL I would...... 
But I understand what you're saying 
Heck, I thought the Birthday Kitty would get canned food, while the party guests got cake!
If the cake were for the cat, it would have to be one of those meat cakes:
(ROFLMAO)
http://forum.cakecentral.com/cake-decorating-ftopict-38051-meat.html
How to Celebrate Your Pet's Birthday:
http://www.petcakes.com/ssi-html.cgi?loc=0&part=main.html
http://cats.about.com/od/youandyourcat/ss/birthday.htm
http://www.partypop.com/Themes/PET0003.html
http://www.flickr.com/groups/birthdaycats/
Guys! It's a CAT!! Who CARES what the cat thinks!! It's not like the cat is going to call you with feedback and a written thank you note!
But I don't know one person who would order a birthday cake for their pet. Please don't tell me she is inviting all the other little kitties in the neighborhood and buying them little paper hats, too?
)
LOL, man I got to do to bed, I am starting to see Kitty Party Invites. I wonder if dog could be invited?
Good Luck with the cake and Good night all! 
I really like JanH's idea of a pillow cake with a can of cat food on top. If the owner is throwing the cat a birthday, then the cat is definitely pampered.
Some people treat their animals like kids...nowadays my dad treats his dogs better than he treated us! The dogs even have one of those "mister" things like at the fair, so when it gets hot they can get cooled off!
This topic is too funny!! My cat lived to be 21. And I had birthday cakes for her too. But I just got mine at Walmart with Happy Birthday Sugar wrote on it. The cashier thought it was for a signifcant other and said Sugar huh! I didn't have the heart to say it was for my cat.
Had I know about personal cakes other than ones from Walmart with just flowers and writing I would have totally got her one with a tiara!!!!
A birthday cake for a cat? I don't believe it either! But, it's an excuse for somebody to ask you to make a cake; so make it special. I'm curious what the cat's name is. Maybe there is a play on words in it for another idea.
cake is for all occassions!
definitely agree! LOL.
I think the pet cake thing is just the same as making a cake for your 1 year old- I mean look at all the elaborate fancy amazing cakes made for 1 year olds, and it's not really about them, because they are too young to 'get' the cake design lol.
But she loves her cat enough to celebrate its birthday (I think all birthdays are important myself lol), so yeah I like the pampered idea- pillow wity fancy feast on top or something.
Another cute one, one I'm sure you'd find numerous photos of online, a kitten poking its head out of a basket or a bag or something else, cats are always climbing into things. Like maybe a basketweave cake with a lid and one side of the lid propped open and the kitten's head poking out.
Or a baby buggy with a cat's head sticking out of the covers, paws on the blankets, you know, the lady's little baby kind of thing.
Well that's all I can come up with, good luck!
My business partner did one that was a party for a snake. It's in her photos - her CC name is Suebee, its a BIG white mouse/rat.
Hey we do what they want right? As long as they pay!
I did draw the line when someone wanted a cake with a dead deer and blood all over - YUCK!!!! 
Good luck - party sound fun!!!!!
I've also done the kitty on a ball of yarn cake - and yes, it was to celebrate a cat's birthday! The kitty was made to look like the birthday cat!:
http://www.cakecentral.com/cake-photo_60869.html
bonjovibabe: That cake is very cute!
oceanspitfire: A cake for a cat isn't the same as a cake for a one-year old in my opinion ... yes the recipient doesn't appreciate the cake; but at least the baby is having party guests over!
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