Ben is 15 years old next month. Has arthritis (on meds for that, responds pretty well), restricted vision due to cataracts, a bit deaf (selectively sometimes! ).

He has been slowing down a bit these past few days with his walking, not sure if this is due to his arthritis or the following:

Last night he was out walking in the garden and he collapsed - back legs went first, then he rolled over onto his side and was unresponsive for a few seconds. He also had a very small bowel movement behind him, perhaps this was there already (it seemed fresh) or was as a result of the collapse, some involuntary action maybe. Note: I wasn't with him at the time, my wife was, so this is what she told me, ie I didn't see the initial collapse with my own eyes.

My wife dashed back into the house to get me, I went to him and by then his head was up and he was looking around. He seemed non-plussed yet relaxed, no apparent distress. After ten minutes or so we thought we would see if he could get up and he did so we slowly walked him back into the house. Still seemed fine but a little tired yet still relaxed.

Called the vet out, his heart was checked (was fine), temperature (fine), etc. No apparent problem found. When the vet arrived he was of course full of energy, wanting a fuss, etc as usual.

He slept well overnight and seems okay at the moment, although he is still walking a bit slower than usual as he has been for the past few days, he also doesn't want to walk quite as far when on his walk but is still keen to say hello to other dogs and is interested in his surroundings.

He's been put on Vivitonin which apparently increases the blood flow.

His appetite is fine.

Could he have had a mild stroke?

It's all rather puzzling. All ideas welcome.

Thanks