( ( Hookworms Hookworms ) ( ( are ( ( ( tiny ( , ( threadlike parasites ) ) ) ( that ( affect ( puppies ( and ( adult dogs ) ) ) ) ) ) ( -LRB- ( ( although ( ( less common ) ( , ( cats ( ( can also ) ( contract hookworms ) ) ) ) ) ) -RRB- ) ) ) ) . ) )
(ROOT (S (NP (NNP Hookworms) (NNP Hookworms)) (VP (VBP are) (NP (NP (NP (JJ tiny) (, ,) (JJ threadlike) (NNS parasites)) (SBAR (WHNP (WDT that)) (S (VP (VBP affect) (NP (NNS puppies) (CC and) (NN adult) (NNS dogs)))))) (PRN (-LRB- -LRB-) (SBAR (IN although) (S (S (ADJP (RBR less) (JJ common))) (, ,) (NP (NNS cats)) (VP (MD can) (ADVP (RB also)) (VP (VB contract) (NP (NNS hookworms)))))) (-RRB- -RRB-)))) (. .)))
Hookworms Hookworms are tiny, threadlike parasites that affect puppies and adult dogs (although less common, cats can also contract hookworms).
(ROOT (S (NP (DT A) (NN hookworm)) (VP (VBZ is) (VP (VBN classified) (PP (IN as) (NP (DT a) (NN parasite))))) (. .)))
A hookworm is classified as a parasite.