The depressed cat ;-)

I have a depressed cat. He is normally so lively and happy. Although he is not really our cat, he just stays here sometimes... quite a lot right now...

He has some implant under the skin to protect him from the ticks and we have been informed that the side affect is depression. He sleeps so much -he normally wakes up at 5am to be let out and is not doing that now- and has taken to comfort eating! He even looks depressed!

I've never seen a depressed cat before... we shouldn't laugh because it is so sad.... however....it is funny to have a depressed cat... I wonder what next?