When you get your GSD pup, they may be about the same size, so your Pom shouldn't be frightened and as your GSD pup grows, they will probably be bonded together so your GSDs increase in size will probably go unnoticed by your Pom.
I have to say, my 5yo GSD girl loves little dogs, regardless of how badly mannered they are, she puts up with their aggression and just enjoys being around them.
My 3yo GSD male only loves very dominant, tough little dogs, he doesn't do well with ones that are fearful.
I'm sure you will be fine, you might have to iron out a few wrinkles but you probably would regardless of the breed
if your GSD is eating and eating and eating and losing weight - please consider testing for EPI.
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