My family has always had Boxers.
I recognise the 'don't let them drink sea water' phenomenon, Cliodna.
My bro-in-law had unspeakable stuff to clear out of the back of his firm's car (top Jaguar salesman in the north west) when they took Alfie (dog) to Shell Island for his first birthday!
And one of mine pebble-dashed the whole house in my absence one day after eating a box of fire-lighters and the remnants of a chicken bhuna! 
Great dogs ..... but daft as 'owt. 
You all know the toddler bang-the pegs-into- the- hole toy?
My last Boxer, Jasper, would lie on the hearth rug while Ben -as a toddler - knocked the hammer of said toy methodically into the small dip between his eyes.
Very patient but the look to me was 'You silly tart. ARE YOU NOT GOING TO DO ANYTHING ABOUT THIS?'
They are great escape artists, aren't they, and ours escaped early one morning and was flattened by a gurt big truck which didn't stop but was seen by the paper lad who came howling to my front door.
The dog dragged himself home and died in the I'M A SCAMMER SPAMMER!!!.
 
