Homer being sick

Homer's back legs have gone weak. He was fine yesterday, he ran around playing ball in the park and was happy in the evening moving freely. Last night he was retching a lot, he didn't loose much food through regurgitation but bringing up phlegm and having to forcefully clear his throat. This morning he was a tired not hungry, and continuting to retch so I took him up to teh vet for a Cernia injection. He was relactant at first but walked 200m to the vet. This morning he is finding it harder to move around and hard to sit upright to eat. He had some breakfast late morning but some of that came out again.
He could be a bit stiff but yesterday's exersise was not any more than usual.
He was tested for myasthenia gravis and negative when this all started.
 
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