The sound of Diesel's tags clinking together was more noticeable with the start of the cold weather, especially when we go out really late at night or really early in the morning. I just found this product at the doggie daycare's store
QUIET SPOT Pet Tag Silencer - Gear 4 Dogs Online Store
It took him a few days to get used to it, it is really lightweight but he could tell there was something there & tried to get at it but eventually got used to it & ignores it now. It's made quite a difference!
Glad it works for you.
(I actually like being able to hear Bella's tags jangle when she is off leash.)
Diez doesn't go off leash, but I can see if he did why it'd be good to hear them.