I made every mistake in the book with my first dog. Here's what I know now:

1. The first 48 hours set the tone. Where your dog sleeps the first night is where they'll expect to sleep forever. Decide that boundary now, not later.

2. "Good food" doesn't mean expensive food. Learn to read ingredient labels. If the first ingredient isn't a named protein (chicken, beef, salmon), keep looking. Skip anything with "meat by-products" as the lead.

3. Puppies bite. It's not aggression. They're teething and exploring. Redirect to a chew toy every single time. Consistency beats correction.

4. Vet visits aren't just for emergencies. Your first wellness check should happen within a week of bringing your pet home. Get a baseline. It saves money and heartache later.

5. Socialization has a window. Between 3-14 weeks, your puppy's brain is a sponge for new experiences. Every positive interaction with a new person, dog, or sound during this window pays dividends for years.

I put everything I've learned into a comprehensive guide for new pet parents. If you're in the thick of it right now, it might save you some trial and error.