<human>: Could you distill the essence of the text into 1-3 sentences?

My mom adopted a shih tzu puppy who is now about 10 months old. She was scared/is scared of other dogs attacking him because he is so small and has limited his contact with other dogs. His first interactions with dogs weren't stellar.

My sisters 75lb lab is extremely indifferent to other dogs and prefers they leave her alone. So she has growled at him quite a few times, sometimes just so he doesn't go near her, other times because he's pestering her (stealing her stuff, trying to catch her tail, etc). She will obey if you tell her to 'be nice' and not growl but she hasn't been welcoming and will growl if you aren't paying attention.

The second dog was a ~95lb lab/mastiff mix, both times he growled/snapped at the puppy it was due to human mistakes (putting down food, putting the puppy in the lab/mastiff's space for a 'cute' photo). It only encouraged my mom to keep him away from big dogs.

Then my aunt got a puppy, and also has outside cats. Our puppy was TERRIFIED of the cat & puppy while the other puppy was playing fine. Since then she has been trying to socialize him more by taking him to the dog park but he still seems pretty afraid of other dogs and it seems like he doesn't really know how to play with them. Sometimes it looks like he wants to chase them and play but just isn't sure. If they chase him he gets scared. If they try to sniff him he keeps his tail between his legs and circles around us to avoid them or stands there looking uncomfortable until he sees an opening to run away. We're not really sure what to do at this point to help. Any help is appreciated.
<bot>: Puppy had bad first experiences with big dogs and little other interaction with critters. He now seems to be scared of all dogs (and some cats) and we're hoping to fix that.