Cheapest priced copy (Modern Horizons 3): $0.35 at Card Kingdom, near mint, their price list as of .
Faithful Watchdog 
Creature — Dog · 0/0 · Common · Modern Horizons 3 · #185
Vigilance
This creature enters with three +1/+1 counters on it.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Modern Horizons 3 | 185 | Common | $0.35 | $0.49 |