The Gibson Girls of the canine world!
Oh, and about the rifle...a typical sporterization of a commercial "Long Lee" IMO. Almost certainly done by a previous owner. Notice the wood infill on the left side where a Jeffrey No9 sight (most likely) would have folded forward.
There should be a two digit date under the barrel for the year of production and this is also very likely a pre-1898 rifle, as those two digits will tell you.