Zeus likes to snuggle with us. He curls with us in the sofa often. I do not intentionly interrupt him when he is asleep. The problem is when I move my legs to stretch, he would growl and show his teeth (sometimes he snaps me). And, when I move my hand to get something over part of his body/head (I didn't touch him, but he could feel my movement), he would snap me... When he curls with me and puts his head on my thigh, I can't put my hand on his body. He will growl/snap and jump out of the sofa. He doesn't show these kinds of aggression when he is awake or when we play. Zeus is very alert. I can't touch him and massage him when he is awake. However, I can't keep my hand on his body without movement. He is scared and stays away from me....
Before the netuer operation, we snuggled all the time without any problem mentioned above. I did ask the vet indirectly one time. But he didn't say anything wrong...

then put Zeus off the sofa before he falls asleep, & have him sleep elsewhere.

Doh

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Bugger the lot of them