What happened with Kryten?
We tried Tramadol on our GSD but it kind of made him act like we'd given him an espresso.
When given at a high enough dose to actually be effective as a pain killer it destroyed his willingness to eat. Bear in mind that this was following surgery which included cutting the bone and his prescribed dose was 900mg/day. It turns out anything over 200mg/day he stops eating. It made getting enough food into him so that he could have ALL the necessary medications incredibly difficult. I was hand feeding him piece by piece and getting just enough into him to avoid having the vet force feed him so he could start healing properly.