This is the 13546th most frequent Polish word.
pieskiem
The Polish word "pieskiem" means "little dog" or "doggy" in the dative or instrumental case.
In this sentence, 'pieskiem' is used as an instrumental singular form of 'piesek' (a diminutive form of 'pies', meaning 'dog'). It shows possession and indicates an endearing tone.
Mój sąsiad chodzi na spacer z pieskiem każdego ranka.
My neighbor takes his dog for a walk every morning.
Here, 'pieska' refers to 'piesek' in its singular accusative form, used to express the object of the emotion and observation.
Gdy zobaczyłem tego pieska na ulicy, poczułem smutek i współczucie.
When I saw this little dog on the street, I felt sadness and compassion.
The word 'pieskiem' in this context is a singular instrumental form again, indicating the entity with which the children are playing, with a diminutive and affectionate connotation.