I worm the dogs every Three months and usually give them Drontal.
Last year I couldn't get Drontal once and I was given Milbamax and my two boys got severe tummy upset and horrible watery poo after taking them. They both had to have medication to clear it up. It may have been co-incidence but I haven't used them since, just in case.
Tonight the vets had no Drontal and won't have for a while they gave me Zantal.
Anyone tried them?