If the guy is acting normal and you are sure he is using the litter box he is ok. A vet visit wouldn't hurt. I have to say, that is a pretty rapid weight gain. I am hoping you scale is off or the weighing process is in error.

that is where Liono went from the Thundercats....or Snarf maybe?:eek: seriously, I have healthcare for my cats...24 a month, covers all maintance and shots, they get yearly dental and health checks covered...i pay the bill then they reimburse me (i get the $ in 2 weeks usually) www.vpi.com i think...well worth it. My cat Frack was in the intensive care unit for 2 weeks and it covered it....maine coon?

He is using the litterbox as usual. No strange activity there...
I've been home with him all morning so far, and he actually is looking a little better (thinner). Maybe I just didin't realize how big he really was before I left. In any case, I'm going to keep an eye on him while I'm off for the rest of the week and if he still looks weird I'll take him to the vet. He bit my ankle twice today so far, so he is definitely his same old self!