Two Dogs, One Bladder

I know I have weird sisters.  I had one and recruited a weirder one.  But here is the strangest part of my surviving pack members.  Even though they are not twins, nor from the same litter, they share one bladder.

River almost never pees.  She gets up in the morning and goes outside, sniffs the ground, sniffs the air, looks around, sits down, chews her paw, rolls on her back, looks at the sun, and then Daddy yells at her to pee.  River tells him she has performance anxiety and can’t pee under pressure.  Five or ten minutes later she squirts out a bit.  If it is raining and she is left to go on her pee pads inside she can take up to an hour to pee.

Pocket wakes up and is brought outside to pee first.  She comes back in and River goes out.  Then Pocket goes back out and pees.  She comes in, Mommy showers, Daddy plays ball with Pocket, and Pocket gets excited and pees, sometimes on the pad, and sometimes not on the pad.  Then Daddy showers, and when he is done he takes Pocket out and she pees.  Then after breakfast he takes Pocket out and she pees.

During the day Pocket will pee three or four more times before supper.  Just before supper River will got out for her second pee on the day.  During the evening Pocket will pee three more times before bed while River will have one more pee after playing with her treat ball.  That is 12 Pocket pees to 3 River pees

So the answer is obvious.  Somehow my sisters are sharing one bladder and Pocket, being the more generous of the two, is the one who pees more often.  How else could you explain such a thing?  So it any dogs don’t want to pee send a note to Pocket.  She loves it