Neighbor and tenant fence dispute

[David P.]

Hey guys, wanted your take on something. My neighbor next door is asking to split the cost of converting a wood fence to cylinder blocks due to my tenant hosing down the yard due to pets waste and water sloping into her side. My tenant brought 2 dogs although I never allowed them pets since the start. I'm in California and since they been paying rent i didn't want to stir things up. The cost of the conversion is $6k and the neighbor is willing to go in half. So 3k each. Should I ask tenant to split it with me since all this came from them having pets and needing to hose down the side yard everyday? I don't charge them a pet fee. Also to note the current wood fence is in pretty bad shape but was fine for it's purpose. This all came up from the neighbor side getting all the waste water due to cleaning up their pets waste.