He was a bald headed character who had his own radio program at the same station Frasier broadcast from.
I think he was introduced fairly late in the series but really, the acting and shtick was so bad I am surprised you don’t remember him.
I’ve had to deal with a person professionally who I’d swear was the Bulldog character was based on.
Unpleasant.
I think I only watched Frasier until the mid 90s. so I never saw the series in its entirety.