after our dog has been for a swim within an hour he starts to act strangly in that he lays down and kicks his back legs as in a spasm then he gets up and runs around hyperactive in short bursts. He is very restless and can't settle, he wants to be on the move all the time. Also he constanly licks and nibbles his feet. Has anybody got any ideas about this weird behaviour although he is a lively 2 yr old Cocker Spaniel this is un usual behaviour. Please help !  Thank you ! 

Sometimes chewing of the feet and paws could be caused by a fungal infection....and maybe the waters irritating it! Even if the waters running it still could have mites and if he has sensitive skin this could irritate it. If you are worried about this i would get the vet to have a look.