I read a lot about lenses on photography sites, and typically the writers mention when you use a portrait lens...typically between 85mm and 135mm that it is not good for the lens to be "too sharp" because then the model or subject of the photograph will worry about someone seeing every blemish or imperfection.
But, I don't feel that should be a problem for animals and of course dogs, which I take a lot of photographs of. So using the Zeiss Loxia 85mm 2.4 lens is just fine even though I have to admit that it is crazy sharp. Kind of fun to take a photo and wonder if it is sharp and then look at it and say "holy cow" Well that is the Loxia. It is expensive but if you rent it instead of buying it, a much better deal.