Not really. The Law of Equivalent Exchange in terms of Human Transmutation mainly comes into play with the value of a Human Soul. There is no known alchemic ingredient that matches the value of one, so attempting to create human life goes against the Law of Equivalent Exchange. Tucker simply fused his daughter with his dog. At no point did he need to create a new human soul for this. Thus, we can conclude that the creation of human chimeras does not violate the Law of Equivalent Exchange.

Depending on one's preferences