I have a whole lot of history w/ ibd/ibs/colitis w/ my Marcel - we had him on Metro/Tylan/Panacur/Amoxi - you name it. None of which truly helped. I am not a fan of Metro - while it may help initially, it can often begin to cause the symptoms it was supposed to help; it can also begin to be quite toxic after a while. I actually suspected toxicity after Marcel was on it for about 10 days, called my vet, told her my findings - and she actually agreed. Metro is *not* an easy drug - it can be quite potent and sometimes unpredictable. Tylan can be the same way - helpful at first, then causing symptoms; for other dogs, though, Tylan can be a miracle - not for us though. Keep an eye out for any odd neuro symptoms w/ the Metro as this can be a sign of toxic build up.
Ginger, btw, is a very amazing herb for the tummy - so you may see some benefit there - esp. w/ the probiotics. Ginger is often used for motion sickness too.
For us, the key to healing Marcel was no meds and getting him on a hypoallergenic diet so his intestines could heal and rest - so I homecooked for him for about 2 mths (whitefish based diet - I worked with a nutritionist via phone consult) - then we moved to Natures Variety Raw Frozen. Once he moved to the fish diet - he had firm poos 1.5 days later (that was after 4 mths of nothing but mushy mucousy bloody poos). So, if it were me, looking back - I'd forget the meds and follow what this new vet is telling you. I'd also stop feeding ALL chicken and beef for a good, long while.
