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