The film just falls apart

I just watched this movie as my sister and her son really enjoyed it and said that they laughed a lot. Well, the dogs are cute and the way they talk looks good but that's about all! I realise that the film is fantastical but it fails on so many basic facts. These faults ruined the film for me, more than the acting.

1) Hubble explains that coyotes 'appear' to howl at the moon but 'in fact' howl at Sirius which is two stars left of the moon. The major fault being that the moon isn't static but travels across the night sky.

2) Hubble explains his superjump as a skill defined by the gravity on Sirius. So how can he possibly do that on Earth?

3) In one scene, the girl in the film (Connie) asks Owen to tell her what Hubble has just said since she can't understand dog language. Fair enough. Moments later, however, Hubble asks Owen about 'the Plan', and Connie responds without having the question translated. A little odd methinks.

...and then of course there is the fact that dogs can't manipulate things with their paws, so who built the spacecraft? human slaves? Dogs have evolved with mankind now for millenia but artificial selection in the last 3 centuries has produced the staggering array of breeds. So have the Sirius dogs been taking our breeds back with them or have they evolved in parallel? Is the Greater Dane actually an Earthling-cum-Sirian? I know I am taking this too far but even fantasy films need to explain a few things. Maybe they should have started the film with "in an alternative universe..."

At the end of the day, my nephew really enjoyed the film and he is 6. I will just have to make sure that he doesn't grow up believing that Sirius moves with the moon.

I am interested to hear if anyone else noticed any plot holes...

ruhduh