DS is 13 months, and our cat 'Harry' is definitely his favourite person in the world.
'Harry' ( or 'awwi') was his first word, followed my Mummy and Daddy - nice to know the pecking order!!
He's learnt not to grab at him now after Harry scratched him one day (he was severely provoked) but I can't say that Harry loves DS quite as much as DS loves him!!!!
I think it's great to have pets with kids, and I'm really pleased that our childminder has a dog, so he sees them regularly too.
I also have a very unscientific theory that growing up with pets can help prevent allergies.
It's completely unfounded, but DH was always allergic to cats until Harry's predecesor (sp?) moved in with us. Dh sneezed and sniffed for a few months and then seemed to get over it.
I grew up with dogs and never had a problem, but now we don't have one. Now when I visit my Dad, who has a lab, I sneeze and sniff like mad, so I think it's possible to build up a tolerance to them, in some cases.
Just my pet theory (geddit?!) but it was a factor in us choosing to get another cat when I was pregnant