Dr. Bruce called last night... Pili has Lyme Disease! Poor puppy! She has been lame on and off all spring, but progressively getting worse. At first we thought it was just that she was out of shape from the winter and needed time. She tested negative in March, was vaccinated, we consistently use Frontline, and check her! I didn't think she could get it but I guess nothing is !00%. Dr. Bruce said that 95% of dogs do very well and can be treated with 4 weeks of antibiotics (doxycycline). She's having a urine test this morning to make sure it hasn't gone into her kidneys... which makes up the other 5% of dogs that do very poorly. He thinks she will start to feel better in a few days.
On a positive note, things have been better at home since our disastrous night earlier in the week. Not that Jacob isn't working on being a better listener... :-)