New cat aggression & other housecat hisses and hides

Hi all! New here and apologize in advance as I'm sure others have posted similar situations.
Would love any help/advice: 

We had one cat at home for 1 year named Slinky, she's 3.

We just adopted a boy cat named Bug, he's 2. Both are spayed and neutered.

It's been 3 months and they still are not getting along. We keep them separate (we have to), but during any supervised encounters it doesn't go well and i've seen little to no progress.
Bug is very curious and wants to pounce on her every single time. He really wants food or he really wants her. He won't leave her be. 

She Hates him and hisses and growls and always hides/swats at him.

On the other hand, he won't get the hint and leave her alone...he continues to chase her every time we let the be together. We are still keeping them mostly separate and trying to do all the 'right' things (slow intros, pheromones, etc). I'm at a loss of how to get them to even co-exist. Would so appreciate any advice.

They've both been to vet and are otherwise healthy.

Thank you!

It simply sounds like Slinky isn't ready to meet Bug. Stick to feeding on either side of a cracked door/partially covered screen until Slinky shows that she's ready to move forward.

Feliway would be a good idea too, and you might find Spirit Essences help things along.

Be sure to give Bug plenty of interactive playtime to drain his energy in a positive way. Play will help boost Slinky's confidence too, which should help her to stand her ground.

Remember that introductions take time - sometimes lots of time. There is no schedule - cats work to their own timescales. Stay patient. 3 months isn't all that long really. They'll accept each other when they're ready.[article="32680"][/article][article="29726"][/article][article="30307"][/article][article="30316"][/article][article="0"][/article][article="0"][/article]

Hi Columbine-

Thanks so much for the reply. Unfortunately, we've never been able to get them to eat on either side of a door or anything like that. Bug loves food and will go wherever it is. But Slinky is much more timid. She has NO interest in going to the door knowing Bug is behind it. Even when at feeding times, she just won't go up there and will just not eat. 

Not sure how else to slowy introduce them. We have a harness for him too and will hold him while she sits there.

I have tried Feliway diffusers, Feliway collars, and Comfort Zone Spray. Haven't seen any affects at all. 

And when I do let them together, she just runs and hides and/or hisses and gets all crunched up with her eyes dilated whenever he comes closer than 4-5 feet. 
We do try to play with them each, but I've just never seen any progress. And when they have been together, if they get too close, he just lunges at her and they fight and screech and she ends up peeing in fear.

We are considering Prozac for him and Buspar for her. 

Slinky's clearly saying she isn't ready to meet Bug. Don't try to force it. Try the feeding with a fully closed door, and work out how close Slinky gat get to the door whilst being able to eat. If that's halfway across the room, then that's fine. Start from there, and use some tape to mark her 'challenge line'. Every day, move the plate forward a little - if an inch each day is all she can do, then that's ok. It might take time, but she will work this out if you help her. Patience is the key. Some members here have needed a full year to get two cats comfortable together. I'm not saying that's how long Slinky and Bug will take - just trying to add a little perspective.

Also, please, please try Composure before putting them on medication. Spirit Essences, too, can make a real difference. I would always prefer to give those options a chance before jumping to prescription meds.

I hope this helps. Remember - you have to start from where the cats are, not from where you'd like them to be.