Hi there, doc
Welcome to the forum.  Happy birthday to your dog ?.
It is not silly at all. We love our pets, and giving them special gifts is one way to show our passion.
As for dog birthday gifts ideas.
A few things come to my mind, if you do not already have them.
A smart dog collar. Maybe with GPS?
A doggy fountain.
A dog house.
A custom Pet Portrait
or a statue.
An automatic dog feeder.
A dog DNA test.
A dog car seat.
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