Why won't dogs take trazadone?

Hi!

I'm not looking for advice or anything, just curious about why specifically traz.

I work at an animal shelter and we give the dogs trazadone, we usually stick it in hot dogs. For any other pill they eat it just fine, but with trazadone specifically a lot will eat around the pill/spit it out.

Idk if they can feel the effects of traz or if they chew too slowly and they get the "icky medicine" taste or there's something abt the smell they don't like.

I'm curious if anyone else has had this problem/noticed. I just wanna understand a bit better abt why without personifying the dogs.

Thanks! ;;

(PS. Incase anyone asks- we do work with the dogs, we give them traz so they're easier to manage/work with; also to help them relax a bit in the shelter bc no matter what you do it's very stressful and fear inducing for any dog)

[EDIT] Thank you guys for all your replies and tips! :D I was assuming it's the taste bc it's just specifically their traz.