I have a male pom/japanese spitz who is currently 1 year old. He is a really affectionate lovely boy and a great dog. He loves to play and is always play fighting with our other dog (female pom)
We got him when he was 16 weeks old and I think he spent the "crucial" 8-12 week period in an apartment complex without seeing much light of day. When we got him we took him out and socialized him as much as we could and he is pretty good with smaller dogs.
Lately we have taken him to our local dog park and started letting him off the lead and he absolutely LOVES it. He runs around, sniffs etc etc. There is a problem though...when he see's a small dog he is usually fine and will run up and start engaging play fighting/chasing/sniffing etc, however any dog that is bigger then him that actually reciprocates and starts playing back and chasing him he suddenly stars running for his life crying with his tail under his legs and will not stop till the dog stop chasing him.
He is also completely scared out of his mind if a bigger dog (Labrador) for example comes up for a friendly sniff, he begins squealing and running into my arms or running for his life...
I think he hasn't had the socialization that he needs? He LOVES the dog park though and getting off the lead and playing with other small dogs... will it just take more off lead time and experience? He seems to be going through that second "fear" stage that dogs go through from 10 - 14 months.
Thanks for all replies.