Ms Godsell had returned home from Totton railway station where Watson had been learning how to settle on a train journey and recalled sitting on the sofa feeling unwell.
"Watson is usually a really chilled dog", she explained, "so I couldn't understand why he wouldn't stop nudging me" which he was trained to do in an emergency.
She said: "I tried to go upstairs and lie down, but he blocked the stairs by standing in front of them. In the end, I gave up and sat back down on the sofa."
Watson went into the garden and started barking persistently, something she said is "completely out of character for him" but "it got my neighbour, Sue's, attention".
"Sue knew that Watson didn't usually bark, so came round to investigate, she told me I didn't look well and, despite me protesting that it was just indigestion, she called an ambulance." Sue was suffering a heart attack.