Hahaha, Corgi. That's hilarious.
Yes, I hadn't thought of that... Roxie did bark at the tincan a few times when we first started using it, but then she got annoyed by all the noises droning her out (it was kind of a fight!

) and stopped barking, since she noticed that when she stopped so did the noise.
The spray collars I speak of are the citronella spray collars. I found an article about it somewhere online, but sometimes it sprays into the dogs eyes and can hurt them. My friend's beagle yiped every time it sprayed, making it spray even more! However, I can't tell you that it was hurting the beagle, it could've just freaked it out.
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My animal family:

2 Dogs; Roxie- 3 year old Black Tri Aussie Shepherd, Zaeda- 8 year old German Shepherd + Aussie Shepherd cross rescue.

1 Cat; Cider- 6 year old rescue mix.

1 Mouse; Peach- white & orange rescue mouse, age unknown.
I love animals!