Clinical and pathological findings are reported from a series of 12 cases of disseminated aspergillosis (A. terreus) in 11 German Shepherd dogs and one Dalmatian referred to Murdoch University Veterinary Hospital (MUVH) over the period 1980 to 1984. A preliminary study of humoral and cell mediated immune components and complement levels revealed no consistent abnormality in 9 dogs tested apart from raised IgG levels. Serum IgA levels were depressed in 30% of cases. Serial data from one extensively monitored case is presented. The unusual epidemiological and pathogenetic features of the disease are discussed.

Two cases of urethro‐rectal fistulae in young dogs are described and attempts are made to explain the embryological origin of these defects. Résumé. On décrit deux cas de fistules urétrorectales chez de jeunes chiens, et on a tenté d'expliquer l'origine embrylologique de ces défauts. Zusammenfassung. Zwei Fälle von Harnröhren‐Mastdarmfisteln in jungen Hunden sind besch‐rieben und man versucht den embryologischen Ursprung von diesen Defekten zu erklären.

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SUMMARYRadiological examinations were carried out on ten sheep to see what changes in intestinal motility and flow of digesta were caused by intestinal cannulation. Barium sulphate was injected or infused into the abomasum via an implanted catheter; its passage through the intestine and associated muscular contractions were observed using X-ray image intensification. Once the normal pattern had been established for each individual, single or re-entrant cannulae were inserted into one of four positions in the small intestine.All the cannulations caused some disruption of the normal flow of digesta, causing retention of digesta and distension of the intestine around and proximal to the intraluminal flanges of the cannulae. The duodenum was affected the most, particularly by one type of re-entrant cannula which reduced the degree of jejunal filling; peristaltic contractions often failed to propagate beyond these cannulae and also caused some retrograde movement of digesta between the cannulation site and the duodenal bulb during the irregular contraction phase (ICP) of the migrating myoelectric complex (MMC). These re-entrant cannulae also impaired the clearing effect of regular contraction phase (RCP).