You are lucky Michael, and all things being equal, that's the way it should be.
Montrose has a genetic thing, two of her front nails (and a friend's dog from the same bloodline) grow much faster than the others. They have always needed clipping. Her back nails, hardly ever, until now with her back/leg problems and she can not longer go for walks on hard surfaces.
Dylan, he really only needs his back nails done.
Monty, she really only needs her front nails done.
Should I ask for a 1/2 & 1/2 dog discount?
