He's only five months - I am assuming once he gets a bit bigger his legs will be further away and he won't wee on them?! He's just weed all over both front legs
Does your adult whippet cock his leg or squat to wee? Thing is their legs are so long squatting is a bit of an effort - they take. Out half n Joe to sit down - it's like folding an umbrella 
Maybe I could encourage leg-cocking? How?