hi aradar,
Young dogs can suffer bone damage from overly intense exercise however at 18 months this is less likely to be a problem. Also free running is much safer than running on lead because the dog will only run at its on pace and is less likely to run to the point of damaging itself. So I think in the case of your dog the exercise routine should be ok. The swimming is particularly ideal because it allows low impact exercise and good lean muscle building. Exercise is also very important for goldens because they are prone to obesity which is associated with a variety of health problems so keep up the good exercise work! Remember of course that if your dog begins to show signs of injury or exercise intolerance during exercise always consult your own veterinarian
If you have any other questions please feel free to ask.
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