So I'm not sure what Axle is actually doing or why, that's why I am hoping someone else may have an idea...
For quite a while, on and off, I have noticed Axle will be relaxed, possibly sleeping (he's usually under the blankets near my feet, sometimes curled up as if he is sleeping) then his hips begin to thrust, as if he is humping.. But he's doing it lying down. He can stand while it's happening and walk towards me. It usually lasts for about 60 seconds, sometimes longer, sometimes shorter. I have only ever seen it happen really late at night or early in the morning. He has never done it during the day while I have been home.
He hasn't done it for a while (well that I've noticed but i usually leave for work at 630 am) but he did do it this morning. I felt the bed moving and quickly pulled the blankets off him. He was lying there doing the humping motion. This time he actually seemed confused (he hasn't appeared to be confused previously)... I put my hand on him for comfort and he stood up, still doing the humping motion. This was also the first time his 'lipstick' was showing, normally it isn't so I have never considered him doing it out of pleasure. I also don't believe it's a dominance issue as 99% of the time it begins while he is laying down and then when he stands, he doesn't actually walk towards something to hump, just the air.
I have spoken to a couple of vets and they aren't too sure. My only option is a blood test to make sure everything is okay (I think I will take him in this week for peace of mind). He stopped doing it for a few months so I thought he was over it.
I google it today though. I found some suggestions that may cause it: a pinched spinal nerve, vitamin b deficiency, partial seizure, irritation and some others that I can't think of right now.
I should also mention Axle is just over 3 years old, and he was neutered at 6 months old.
Has this happened to anyone else? Or am I just worrying for nothing?