In the last few days since it's turned warmer, Dougal has started to pant heavily almost as soon as he goes out the door. It's about 15c in London today - sunny - but not too bad. I just took him to the park and he was totally knackered after about 15 minutes and we had to come back. He actually kept lying down in the park. His coat is quite thick, so that could be one problem (going to be groomed tomorrow). He's only 20 months old, so I'm not sure he should be like this. Any ideas, or just a trip to the vet? He had a stomach problem a few weeks ago and was on anti-biotics, although that has cleared up, so not sure that is anything to do with it.