meech

Hello All, I have a nervy whippet -Greyhound cross who has been on fluoxetine for 6bwks now. We have a road trip coming up (with the hound) that we cannot cancel and she has recently developed an aversion to going faster than 60kmh and having the windows up. I've heard ppl having success with using Phenergan as mild sedative to take the edge off the dog's anxiety. I bought the kids, liquid Phenergan but wanted to ask advice on dosage please? She is 15kg btw. Thanks in advance!