I was just wondering if anyone has any ideas on the problem Im having with my lab,he's 22months old. He is is good condition and full of energy however I am finding recently that when he goes out and runs about with other dogs he is absolutely knackered after 10 mins. I know it has been hot lately but he is still the same now that it has cooled down - I have seen him take about 40 mins to recover from a 10/15 min run around, lying on his side and panting excessively with his heart beating to very high levels. He is eating and drinking as normal and also he is playful as ever, just a bit concerned about how quickly he is tiring - he is regularly excercised.
Thanks for any advice