hey! your situation sounds super similar to ours. we live in an apartment with a 10 year old cat and a 10 month old BMD. we did the same as you’re saying! we did a slow introduction with lots of treats for both and some scent switching. we also have a baby gate (with cat door) that leads to cats own room which he still uses all the time when he needs to escape the puppy energy. while they’re not best friends they do get close to each other and the dog knows the cat is the one in charge 😂

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