Sudden Butt licking with growling

[schmidtstain]

I have a sweet cat who is 3 and has never had a growling problem (except when he's meeting new cats)
Today I got home late and he used the litterbox and brought a little turd out with him, I thought he just batted it out but it was still warm when I picked it up so I'm sure it came out with him.
He started licking his butt almost immediately, like barely 3 steps away from the litterbox, just far enough that he could get onto the carpet. He was growling; and when he stopped, he would walk like the way dogs do when they drag their butt on the carpet, but not all the way down. He's super grumpy now and has just been licking for like 5 minutes and if I try to stop him, he yells at me.
Any suggestions on what this might be? He hasn't hunted since late September so I don't think it's worms, should I take him to the vet?

 

[schmidtstain]

Ive found a blade of grass sticking out of his butt hole and now hes even more pissed at me, IDK what to do

 

[Kieka]

I would take him to a vet. If he had grass in his poop, then he has outside access and may have picked up worms.

 

[Furballsmom]

Hi, did you go to a vet? How are things now? (You didn't pull on the blade of grass?)

 

[tiggerwillow]

Sounds like it could really hurt him to poop, vet time for him i think

 

[Tigger's Mum]

Sounds like he could have blocked anal glands but best take him to the vet who can deal with the problem, also the vet can give you good worm medication for him especially if he is an indoor/outdoor cat.