Table 1.

Differential features of nematode first stage larvae found in fecal samples of dogs.

Nematode	Length (μm)	Caudal end
Angiostrongylus vasorum	310–400	Tip with a dorsal spine and a sinus wave curve
Oslerus osleriFilaroides spp.	~ 250	Absence of dorsal spines and S-shaped end with a slight kink
Crenosoma vulpis	240–310	Pointed and straight tail
Strongyloides stercoralis	150–390	Pointed and straight tail

Note: Adapted from Traversa D, Di Cesare A, Conboy G. Canine and feline cardiopulmonary parasitic nematodes in Europe: emerging and underestimated. Parasit Vectors. 2010;3:62.14 http://creativecommons.org/licenses/by/2.0/.