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From the “Made in Germany” assignation and the lettering style, I would think pre-WWII and likely from the 1920s or 1930s. There seems to be a maker’s name below the dog which might help pin down the date.
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Perhaps you can see it more clearly on the tin than I can from enlarging your pictures (or provide a sharper close-up), but it looks to me like “ROSENFABRIK”, followed by another word or words that are less clear. “FABRIK” means “factory” in German and commonly appended to a surname to give a company/manufacturer name. The second word or words will likely be a town or city where the manufacturer was based, but I can’t make it our apart from the last two letters possibly being “…IN”