python - Pandas: How do I check for value match between columns in same dataframe? -

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i complete coding novice , have been experimenting pandas. first post. thank in advance help!

i remove rows cat1 not match either dog1 or dog2. not have match both, 1 or other. 

   cat1   dog1   dog2 0   red   red    blue   1   red   green  blue   2   blue  red    blue   3   blue  blue   green   4   red   green  blue

i end result follows:

   cat1   dog1   dog2   0   red   red    blue   2   blue  red    blue   3   blue  blue   green

how do this?

this simple:

df.query('cat1 == dog1 or cat1 == dog2')

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