rough as old dogs tits 

when someone looks worse for wear, rough looking, usually older women trying to look younger than they are.

Look at that old woman dressed like a teenager, she looks as rough as old dogs tits!

rough as old dogs tits by Anna Hughes August 4, 2007

as rough as old dog's tits 

means its old rough and not pleasant to look at/ feel

That old lady wearing a mini skirt looks as rough as old dog's tits.

or

After 20 tequila shots I feel as rough as old dog's tits.

as rough as old dog's tits by AnnaHughes August 3, 2007