Introduction
The SportDOG Brand FieldTrainer 425S is a versatile and reliable remote training system designed for stubborn dogs. It provides effective communication with your dog up to 500 yards, offering tone, vibration, and static stimulation options. This system is waterproof and rechargeable, making it suitable for various training environments, including yard work, field training, and close-range hunting.
What's Included
Your SportDOG FieldTrainer 425S package includes the following components:
- Remote Control SD-425S Trainer Transmitter
- Collar Receiver
- Operational Guide
- Charging Adapter
- Lanyard
- Training Manual and DVD
- Test Light

Figure 1: Contents of the SportDOG FieldTrainer 425S package, including the remote transmitter, collar receiver, and accessories.
Setup
1. Charging the Units
Both the Remote Transmitter and the Collar Receiver are equipped with rechargeable Lithium Ion batteries. Before initial use, fully charge both units. A full charge typically takes approximately 2 hours.
- Connect the charging adapter to a standard wall outlet.
- Plug the charging adapter into the charging port on both the Transmitter and the Receiver.
- The indicator lights will show charging status (refer to the Operational Guide for specific light patterns).
2. Fitting the Collar Receiver
Proper fit of the Collar Receiver is crucial for effective and humane operation. The contact points must have direct contact with your dog's skin.
- Position the Collar Receiver on your dog's neck, centered below the jaw.
- Ensure the contact points are touching the skin. You may need to trim some fur if your dog has a thick coat.
- The collar should be snug enough that one finger can barely fit between the strap and your dog's neck.
- Avoid leaving the collar on for more than 12 consecutive hours to prevent skin irritation.

Figure 2: The remote transmitter and collar receiver, ready for use after charging and proper fitting.
3. Pairing the Transmitter and Receiver
Your units are typically paired from the factory. If re-pairing is necessary, follow the instructions in the included Operational Guide.
Operating the System
The FieldTrainer 425S offers multiple stimulation types and levels to suit your dog's temperament and training needs.
Transmitter Controls

Figure 3: Close-up of the remote transmitter, highlighting the stimulation level dial and function buttons.
- Stimulation Level Dial: Adjusts the static stimulation level from 1 (lowest) to 7 (highest).
- Tone Button: Delivers an audible tone to the receiver.
- Vibration Button: Delivers a non-stimulating vibration to the receiver.
- Static Stimulation Buttons: Deliver static stimulation at the selected level. The 425S model has increased stimulation levels for stubborn dogs.
Using the Training Modes
The system allows for quick transitions between tone, vibration, and static stimulation. Always start with the lowest effective stimulation level and gradually increase if necessary. Observe your dog's reaction to determine the appropriate level.
- Tone: Use as a warning or a positive reinforcement signal.
- Vibration: A mild, non-aversive cue that can be used for attention or as a pre-cursor to static stimulation.
- Static Stimulation: Delivers a safe, momentary static pulse. Use for correcting unwanted behaviors or reinforcing commands.
Maintenance
- Cleaning: Wipe down the transmitter and receiver with a damp cloth as needed. Avoid harsh chemicals.
- Battery Care: For optimal battery life, avoid fully discharging the units frequently. Recharge when the battery indicator shows low power.
- Contact Points: Regularly check your dog's neck for any signs of irritation from the contact points. If irritation occurs, discontinue use and consult a veterinarian.
- Storage: Store the system in a cool, dry place when not in use.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Receiver not responding to Transmitter | Low battery on either unit; Units not paired; Out of range | Charge both units; Re-pair units (refer to Operational Guide); Move closer to your dog |
| Dog not reacting to static stimulation | Collar too loose; Fur interfering with contact points; Stimulation level too low | Tighten collar; Trim fur; Increase stimulation level gradually |
| Collar indicator light not working | Low battery; Unit off; Malfunction | Charge unit; Turn unit on; Contact customer support if problem persists |
Specifications
| Feature | Detail |
|---|---|
| Model | SD-425S |
| Range | Up to 500 yards |
| Stimulation Types | Tone, Vibration, Static Stimulation (7 levels) |
| Waterproof | DryTek technology, submersible up to 25 feet |
| Batteries | Rechargeable Lithium Ion |
| Collar Receiver Weight | Approximately 3.3 oz (including strap) |
| Overall Item Weight | 1.26 pounds |
| Manufacturer | SportDog |
| Target Audience | Dogs (All Breeds, Adult) |
Safety Information
- This product is intended for use with dogs only.
- Do not use this product on aggressive dogs.
- Always ensure proper collar fit to prevent skin irritation.
- Never leave the collar on your dog for extended periods (more than 12 hours).
- Use static stimulation responsibly and only at the lowest effective level.
- Keep out of reach of children.
Warranty and Support
For warranty information, product support, or to purchase replacement parts, please refer to the official SportDOG website or contact their customer service department. Details are typically provided in the included Operational Guide and Training Manual.
You can also visit the SportDOG Store on Amazon for additional resources and product information.