Our Riley was diagnosised with a Grade 4 at 8 months. He just turned 7 the end of August. So far, no symptoms nor meds. Prayers that your Chaplin will have to same as Riley. We get an ultrasound every other year, and no changes. He gets his teeth cleaned, so far, no problems. I had him nuetered at 4 months and he did very well. I hope that reassures you a bit.