The very first night we brought Smudger home I fed hom too much, (double what I should have

)
His tummy was very very bloated and he was walking funny. I can laugh about it now but at the time I thought I had killed him, it was huge. I then asked my vet how much I should be feeding and he gave me a chart with how much to feed for weight and age etc
He never had a bloated tummy again. It could be worms though I'm no expert, just giving my experience