Hi my boxer is nearly 10 tonight while out playing he seemed to take so kind of a funny turn, it was if his legs whet gone & he couldn't walk and kept slipping down it last a about 2 mins I held him on my lap for a while and then he came around.. Someone said it could be heat stroke?? We gave him a drink & poured water on his neck it is wam here @ the minute but he always has cold water & doesn't seem to show any other sings of heat stroke! My children saw it happen & got such a shock.. Any ideas