The cat profile over the dog profile is good. I would prefer a different dog breed used in the profile, perhaps more like a lab. The "Miller" font is too narrow or stretch in length for my taste. Overall, I like the concept.
I like #14 and #13 both a lot - but I'm concerned the "mobile" part isn't obvious enough. Also, I'd like to the see a version with the dog be all one color - but the + symbol the same size as in #13.
Is it possible to turn #14 into a truck? The outline is almost in a truck shape already with the "ER" being the front cab of the truck/van and the "MILL" part being the back of the truck?
Nice :) for entry 54 could you put the "Mobile Veterinary Services" under the van to make the image on the van larger and also allow the wording to be larger? Can you do one with "Mobile Veterinary Services" and one with "Mobile Vet?"
for entry 56 we also would need the "Mobile Veterinary Services" part to have larger font. Good work!