| CPC A01K 1/033 (2013.01) [A01K 1/035 (2013.01); A01K 15/024 (2013.01)] | 18 Claims |

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1. A pet structure comprising:
a support structure comprising at least one rod member;
first and second track members adapted to be supported by the support structure, where each of the first and second track members defines
at least one support opening sized and dimensioned to receive the at least one rod member, and
at least one track member slot;
a spacer defining a spacer opening sized and dimensioned to receive the at least one rod member; and
a track ball; wherein
the at least one rod member of the support structure extends through the at least one support opening formed in the first and second track members and the spacer opening defined by the spacer to support the first and second track members at a desired location in space; and
the track ball is supported by the track member slots defined by the first and second track members for limited movement along a track path relative to the support structure.
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