Worst enemies? Two very different dogs having nothing to do with each other in spite of the close proximity. Suggestions: a higher camera angle would eliminate the distracting houses and trees in the distance. The image also seems to be a little over processes--the tones don't seem natural to me.
Something in the color seems off...too yellow maybe? A bit tight on the composition. Need more space past the dogs, especially the dog on the left. While this is a cute pic, the viewer is torn in which way to look. Generally, negative space is left in the direction the subject is looking. Here, in both cases the viewer is taken directly out of the frame on either side. JMO. Good luck in the challenge.