Does it matter who takes care of the pet more?
The primary pet parent will have a stronger claim to their pet, but they’ll need to prove it. If you’re considering taking this to court your partner must have strong feelings about the animal too and probably will state they care equally for the pet. It’s important to have proof of care. Proof can be in the form of receipts for pet supplies and food, bills from the vet and groomer, as well as pictures with the animal to establish your relationship.