The best thing to do is take the cat to the vet and have them retrieve the sample. They will probably do what is called a "cystocentesis", which basically means they will isolate the bladder by palpating the abdomen and then using a small gauge needl...

I really hate to rain on everyone's parade with the whole "corn" issue, but I would like to know what kind of medical training anyone has in nutrition for pets! Corn = energy...it is not bad for your dog! On the other hand, everyone who is preaching ...

If you want to find out for sure what breed Mac is, there is a genetics test that can be done. Your vet would need to take a blood sample and send it to the lab, the panel is called a "Wisdom Panel". It's fairly new, but it gives you the breeds that ...