My girlfriend and I found a kitten a couple weeks ago. Our friend's dog chased him up a tree, and so we took it home for a day until we could find the owner. However, no owner was found and it very much appears the kitten was abandoned, so we decided to keep it. He's 5 months old, curious, friendly, patient, etc. Very well behaved. For the first week or so he was quite an active player, chasing a ball-on-a-stick around the rug just because it was moving so he had to have it.
Then in the 2nd week, he seemed to switch mostly to the stalking kind of play and couldn't be made excited enough to run after toys and jump in the air and perform flips and such. So just stalking play... object goes out of sight, he walks up to the corner, pounces on it, and if he doesn't get it, he just sits down.
Now he seems to have switched to just not wanting to play. He periodically knocks around a ping pong ball, but he just doesn't seem to get very energetic. And since he's 5 months old, at what I understood to be the apex of excitedness, I thought this may be a problem.
We took him to a vet yesterday just to get various shots and such. He got 2 vaccines, has a mild case of ear mites, no worms, and no other problems. Not neutered yet. So medical-wise, he's pretty good.
He has a bowl of hard food and water always available to him and he eats but doesn't over-eat. He's also given half a can of soft food per day which he devours, and some treats for tartar control. So dietary-wise, he seems to be set.
He's quite social (unless too many people are around), he doesn't mean being held in people's arms and cuddling with people, even turns to show you where to scratch. He likes to play with my girlfriend's hair, and usually shows up at sunrise to do just that. He follows us around the house fairly often, although he's not afraid to be alone. So social-wise too he's pretty set.
So I just don't get it. He eats right, is a normal weight, is social, is relatively healthy, and used to be very very active and jumping around and all that. So why has he downgraded in activity so much over 2 weeks? Is he getting used to being an indoor cat after being abandoned and living outdoors? I don't think he was abandoned for more than a day or two though, possibly just a couple hours. I just don't get it, but I'm slightly concerned since he should be as jumpy as he was 2 weeks ago.
Help! (first time cat owner)