asked

My 3-year-old collie, who is very fit and weighs 14.4kg, collapses and lies panting after running non-stop for a while. She stands up shaky on her hind legs and takes nearly an hour to recover. She looks dazed and is on high-energy feed twice a day with exercise before feeding. This behavior only occurs with activity and not at rest. What could be causing this and what should I do?

February 14th, 2024

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