I always thought the jingle of a dog's collar would sound good at that particular point in the song, so you'd imagine what it would sound like. Maybe Gibby wanted to add a dog's collar to the mix, but they wouldn't let him, so he wanted to point out that it belonged there.
The rest of the lyrics seem to be about heroin, so maybe Gibby sees himself as conditioned like Pavlov's dogs.
I always thought the jingle of a dog's collar would sound good at that particular point in the song, so you'd imagine what it would sound like. Maybe Gibby wanted to add a dog's collar to the mix, but they wouldn't let him, so he wanted to point out that it belonged there. The rest of the lyrics seem to be about heroin, so maybe Gibby sees himself as conditioned like Pavlov's dogs.