Does this work better than the Classic? I feel like my cat is getting used to the Classic and it doesn’t calm him as much as it used to.

I have used the multi- cat on & off for years with excellent results, but I wanted to give the optimum. Not sure if it's necessarily better (both are equally effective for us) but it definitely works faster. For your situation, switching to a different formula is worth a shot.

Can the same diffuser i have for the multi cat be used for this?

The instructions actually say to not use another brands diffuser for the refills, and not to use another brands refills in the diffuser. It does not specifically say to not use another one of their own diffusers. I will say I used my old multi cat diffuser and it was fine and worked well.

Can this be plugged in 220v or just 110v?

I believe it would only be safe to use in 110 volt.

Can you use this in a dog friendly home with two cats?

You may want to contact Feliway directly for the best answer. That said, the cat pheromones shouldn't effect your dog. If your dog is a chewer I recommend plugging in somewhere the dog can't reach it since it's ball shaped (or train the dog that it's strictly off limits).

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Optimum Cat Calming Diffuser Refill (3 Pack, 90 Day Supply) – Cat Pheromone Diffuser Refill for Advanced Support to Reduce Stress, Spraying, Scratching, Fighting and Hiding

Product ID: 415236120

⏳30 days continuous calm

🏠700 sq ft coverage

🐾77% less urine spraying

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Description

🐱 Elevate your cat’s zen—because calm cats make happy homes!

EFFORTLESS CALM - Plug in and relax—continuous 24/7 support for up to 30 days per refill.
HARMONY AT HOME - 72% of multi-cat households report calmer, friendlier feline interactions.
NON SEDATIVE SAFETY - Safe for cats, kittens, people, and other pets—no drowsiness, just calm.
VET TRUSTED FORMULA - #1 vet recommended brand with 30 years of feline stress expertise.
STRESS FREE SANCTUARY - Patented pheromone tech reduces stress signs and tension between cats.

FELIWAY Optimum Cat Calming Diffuser Refill delivers up to 30 days of continuous pheromone-based stress relief, covering areas up to 700 sq ft. Clinically proven to reduce urine spraying by 77% and ease multi-cat tensions by 72%, this non-sedative diffuser is safe for all cats and pets. Backed by 30 years of veterinary research, it’s the ultimate solution for a peaceful, harmonious home.

Specifications

ASIN	B09V9VSY53
ASIN	B09V9VSY53
Age Range Description	All Life Stages
Best Sellers Rank	#249 in Pet Supplies ( See Top 100 in Pet Supplies ) #1 in Cat Relaxants
Brand Name	FELIWAY
Breed Recommendation	All Breed Sizes
Color	Clear
Customer Reviews	4.4 4.4 out of 5 stars (13,569)
Date First Available	March 10, 2022
Date First Available	March 10, 2022
Directions	FELIWAY Optimum refills provide calming pheromones continually for up to 30 days in a 700 square foot area. We recommend using an additional diffuser if the room is bigger than 700 square feet. We recommend plugging in the FELIWAY Optimum diffuser in the room where you cat spends the most time. Try not to plug the diffuser under items (e.g. shelves) or close to objects (e.g. behind curtain or door…
Included Components	Refill
Item Package Dimensions L x W x H	4.02 x 3.7 x 3.46 inches
Item Weight	8.1 ounces
Item model number	D92150B
Item model number	D92150B
Manufacturer	Ceva Animal Health
Manufacturer	Ceva Animal Health
Model Name	FELIWAY Optimum Cat, Enhanced Calming Pheromone Diffuser, 30 Day Refill - 3 Pack
Package Dimensions	4.02 x 3.7 x 3.46 inches; 8.15 ounces
Size	3 pack
Specific Uses for Product	Behavior, Indoor
Target Audience Keyword	Cats, house-cats

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