Thumps is uncontolled contractions of the diapharm. The sides of the horse contract hard and they breath very hard as well, ie "thumps"
Generally seen in exahusted horses and due to electrolyte imbalances.
But that said it is also not unusual to see in horses in starts after a lay off, esp if they get nervous and sweat a lot, first time lasix horses, unseasonably warm or really hot days in the summer. Seen it all these cases as well.
CAB, VMD
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