Hi Kateryna
Thank you for reaching out, and sorry to hear about the recent conflict.
I recommend starting the reintroduction process from scratch, which includes room and scent swaps, using barriers, and slow interactions.
It’s generally advisable to put a harness and lead on the puppy. However, in this case, it may also be worth teaching your cat to walk on a harness and lead. When both pets are relaxed, encourage interaction in a quiet room by placing the cat and dog on leashes, then play with them or give them treats. If either pet appears anxious, allow them to retreat or hide. Keep the sessions short and always end on a positive note. It’s ideal to have two people involved in this process—one person supervising each pet and communicating their observations.
If possible, do some pre-clicker training with each pet. Start with cues such as “Sit,” “Stay,” “Come,” and “Go to Mat,” as these commands are invaluable during reintroductions. Teaching your cat these cues can be enriching and adds positive value to your time together.
Reward calm behavior in each pet with tasty treats and brushing, if they enjoy it.
You can also introduce puzzle feeders for the cat and the puppy to keep them engaged during reintroductions in the same room. This can help occupy them without the need to chase or confront each other.
It’s also important to feed your puppy and kitty in separate areas to prevent tension and discourage food guarding.
Ensure there are plenty of escape routes and vertical spaces for your cat so the puppy doesn’t invade her space. Finally, minimize jealousy by engaging in fun activities with both pets.
I hope that helps.
Melina