ThunderShirt Anxiety Vest for Cats, Heather Grey, Medium

This does relax my nervous cat a bit, but it was not enough to prevent her fear-based aggression. If you put it on her, she usually gets relaxed and sleepy, but if you introduce her trigger (our other cats), it is like she isn't wearing it at all and will even lunge at them (through the screen door we have set up for introductions). The sizing is also a little strange; it seems like no matter how I fasten it, it's a little too far forward behind her front legs. The patch for calming spray is in a weird spot (on their shoulder where they can lick it). We've tried various calming sprays, diffusers, supplements, and treats, and this was a bit of a last resort before moving to a prescription. She does seem to like it, so I think it is comforting. So: helps a bit, but if your cat has more intense anxiety, it probably will not work as intended.

I’m not sure if this works or not. My cat definitely doesn’t hate it because she doesn’t run away when I try to put it on her, but she has a hard time moving (or at least pretends to) when it’s on. It doesn’t feel too tight on her because I can fit my fingers easily underneath it, but she stumbles and falls over when she’s wearing it and it freaks me out so I take it off of her. I’m not sure if it’s normal or not. Again, I think if she hated it she would hide when I went to put it on her, but it concerns me how much it makes her stumble.

Works very well on my energetic male cat. He purrs and is instantly calm once his Thundershirt goes on. Although the sizing is a bit off. I used the sizing charts, but still had to size up. I recommend sizing up even if you don't think you have to. The velcro will allow for some adjustment if the Thundershirt ends up being too big, but can't make up for a smaller size. Thankfully, Chewy is pretty generous with their returns and refunds.