Can my dog safely take Rimadyl and Trazodone at the same time?

I cannot find any interaction reports for Trazodone with carprofen (Rimadyl), however there are reports that Trazodone has interactions with Ibuprofen, a similar class of NSAID. This reports that either increases toxicity of the other by added drug effects. Check with your veterinarian on whether he recommends giving the two together. There maybe less toxic effect by giving the Rimadyl in the morning and the Trazodone in the evening. However this is for your vet to decide. If you cannot reach your veterinarian I suggest not to give the Trazodone tonight and keep the dog in a room where she is not likely to be bothered much by trick or treaters.