To be harsh - the dog is old and won't be around much longer. In all likelihood your baby will never cross paths with it.

We adopted a greyhound and he came to us with the name Ben. Friends of ours were pregnant and had chosen Ben as their boys name (we didn't know this) and they named their son Ben when he was born as they figured in the long run it didn't really matter. 5 years down the track and they are right - it hasn't mattered at all