My cat is walking very slowly and low to the ground

What might be wrong? My cat is walking very slowly and low to the ground.

My 5 year old cat began sitting hunched, and walking very slowly and crouched low to ground about two weeks ago. When we pick her up she is tense and curls her back legs and tail under.

Took her to the vet, had multiple base labs drawn: CBC, liver, kidney, thyroid, blood sugar, hydration level, etc.

All were normal. The vet examined her body and found no evidence of physical injury or palpable lumps or swelling.

She continues to groom herself as usual, but we notice her appetite has slightly lessened. Her interests and interaction have waned. She sits quietly and doesn't 'talk' to us like usual.

The only other unusual behavior was about two weeks ago she was standing next to me in the kitchen, meowed at me (not unusual) and proceeded to poop on the floor. She has a cat door, and has never done this before.

We cannot do endless testing, but wondered what the best step would be in narrowing down the problem.

Editor's note: I'm sorry to hear that your kitty is not doing well. It sounds like the vet is on top of things with all of the tests.

I would think the best chances at finding out what the problem is quickly would be to get a consult from another vet. Did they do X-rays? I'm wondering if she injured herself and there just aren't visible signs.

The other thing I'd ask the vet is if it's possible that she has a neurological problem, or perhaps she got into something poisonous?