Bozita have a web site in the UK but they are Scandanavian so may well have a website in Switzerland.

I had success emailing sales department of a local UK food supplier (Butchers Classic) and got suppliers of their product in the UK, so it might be worth doing a google search for your preferred wet food and seeing if you could find a website in Switzerland or a bordering country. Then email their contact email with your queries explaining that you would really, really like to source their product in Switzerland.