, ▁where ▁it ▁helps ▁Per cy ▁and ▁his ▁friends ▁enter ▁Luke ▁Cast ellan ' s ▁boat ▁Princess ▁And rom eda . ▁It ▁later ▁saves ▁the ▁life ▁of ▁T ys on ▁and ▁returns ▁to ▁help ▁the ▁two ▁brothers ▁on ▁several ▁occasions . ▁ ▁Per cy ▁has ▁also ▁tra ve led ▁with ▁a ▁small ▁cal ico ▁k itten ▁called ▁Small ▁Bob ▁by ▁Bob ▁the ▁T itan . ▁Small ▁Bob ▁was ▁accident ally ▁created ▁by ▁one ▁of ▁Atlas ' s ▁servants ▁who ▁was ▁attempting ▁to ▁sum mon ▁a ▁group ▁of ▁sp art oi . ▁When ▁Per cy ▁is ▁tra pped ▁in ▁T art arus ▁during ▁The ▁House ▁of ▁H ades , ▁An nab eth , ▁Bob , ▁and ▁he ▁find ▁and ▁travel ▁with ▁the ▁k itten . ▁He ▁is ▁fond ▁of ▁Bob ▁and ▁protect ive ▁of ▁the ▁travel ing ▁group , ▁leading ▁Bob ▁to ▁call ▁him ▁" a ▁good ▁mon ster ". ▁Small ▁Bob ▁can ▁transform ▁into ▁a ▁full ▁s ized ▁sab er - to oth ed ▁t iger ▁at ▁will ▁and ▁occasionally ▁appears ▁as ▁an ▁x - ray ▁for ▁a ▁few ▁seconds ▁at ▁a ▁time . ▁His ▁p urr ▁is ▁dis pro port ion ately ▁loud ▁for ▁an ▁animal ▁of ▁his ▁size . ▁Small ▁Bob ▁remains ▁in ▁T art arus ▁with ▁I ap et us ▁to ▁help ▁hold ▁open ▁the ▁Do ors ▁of ▁Death . ▁It ▁is ▁unclear ▁if ▁he ▁lives ▁or ▁dies , ▁but ▁he ▁is ▁not ▁mentioned ▁again . ▁ ▁Description ▁▁ ▁Per cy ▁is ▁described ▁as ▁hand some , ▁with ▁mess y