Bacca was diagnosed when he was still just barely a pup. He is now 4 years old. His diagnosis was "by accident"....ie....we were trying to find out why he his mouth had swollen up and bloodwork revealed this.
In reality, it is fairly common in younger dogs, but rarely diagnosed until they get older and actually start to how the symptoms.
Bacca's is controlled with Thyro-tab. About once a year he gets a flare up and kinda goes off his food and regular eating habits. Currently, he is balking at taking his pills.
I've also noticed in the last two years, Bacca stopped playing as well. If I present him with a toy, he just looks at it....."You want me to do WHAT?" And I still find his overall activity level very low. When we go for a walk, off leash, Bacca is always lagging.....
When he goes for his next physical, I will be asking the vet about this.