to have a dog in the fight
Meanings of "to have a dog in the ..."
to be partial, as in:
"I take it you have a dog in the fight?" suggesting the listener is favorable to one party or side.
to be affected by or to have a particular interest in the outcome of a situation.
быть вовлечённым во что-л. или иметь личный интерес к исходу ситуации.