Gorgeous dog.
The lethargy and your mention of weight fits in with our experience of under active thyroid in our Tibetan. Big difference is we rescued Hunnibunni (yes, they really called her that) and we were told she was a fat, lazy dog. So, we'd never experienced her being an active, lively dog.
My wife (a nurse) picked up on the thyroid thing and vet confirmed it after a test.
I'm no vet but I'm sticking my neck out and going for underactive thyroid. I think Springers are particularly susceptible and the other symptoms you mention fit in. With this condition hair loss is sometimes mentioned as a symptom but our dog didn't have any issues there.
The lethargy and your mention of weight fits in with our experience of under active thyroid in our Tibetan. Big difference is we rescued Hunnibunni (yes, they really called her that) and we were told she was a fat, lazy dog. So, we'd never experienced her being an active, lively dog.
My wife (a nurse) picked up on the thyroid thing and vet confirmed it after a test.
I'm no vet but I'm sticking my neck out and going for underactive thyroid. I think Springers are particularly susceptible and the other symptoms you mention fit in. With this condition hair loss is sometimes mentioned as a symptom but our dog didn't have any issues there.