2-component pickerView with array errors

Hi! I am working on a pickerView with two components. I have an array (myHorses) with one stallion and two mares. If I run the app I get an "out of range" error at line 33. If I add another stallion to the array this goes away. Also, the image outlets are showing the images for the stallion on both outlets. How can I make the app work when there is just one member of a gender, and also show the correct images?

Code Block import UIKit
class BreedingViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {
    let myStallions = myHorses.filter({ $0.gender == "Stallion" })
    let myMares = myHorses.filter({ $0.gender == "Mare" })
    var sireIndex = 0
    var damIndex = 0
    @IBOutlet weak var horsePicker: UIPickerView!
	@IBOutlet weak var sireBaseLayer: UIImageView!
    @IBOutlet weak var damBaseLayer: UIImageView!
   
    var recievedString: String = ""
    func numberOfComponents(in sirePicker: UIPickerView) -> Int {
        return 2
    }
   
    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        if component == 0 {
            return myStallions.count
        }
        else {
            return myMares.count
        }
     
    }
    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
            let stallions = myStallions[row]
            let mares = myMares[row]
      
            if component == 0 {
                return "\(stallions.name), health: \(stallions.health)"
            }
            else {
                return "\(mares.name), health: \(mares.health)"
            }
        }
    func pickerView(_ horsePicker: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        var chosenSire = myHorses[sireIndex]
        var chosenDam = myHorses[damIndex]
        if component == 0 {
            let theSire = myHorses[row]
            sireNameOutlet.text = theSire.name
            chosenSire = theSire   
			sireBaseLayer.image = chosenSire.basePhenotype
        }
        else {
            let theMare = myHorses[row]
            damNameOutlet.text = theMare.name
            chosenDam = theMare
			damBaseLayer.image = chosenDam.basePhenotype
        }
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        horsePicker.delegate = self
        horsePicker.dataSource = self
    }
    
}

Code Block 
    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        
        if component == 0 {
            let stallions = myStallions[row]
            return "\(stallions.name), health: \(stallions.health)"
        } else {
            let mares = myMares[row]
            return "\(mares.name), health: \(mares.health)"
        }
    }